py: Rename struct mp_code_state to mp_code_state_t.

Also at _t to mp_exc_stack pre-declaration in struct typedef.
diff --git a/py/bc.c b/py/bc.c
index 5cdaa47..0d0a0b1 100644
--- a/py/bc.c
+++ b/py/bc.c
@@ -89,7 +89,7 @@
 //    - code_state->ip should contain the offset in bytes from the start of
 //      the bytecode chunk to just after n_state and n_exc_stack
 //    - code_state->n_state should be set to the state size (locals plus stack)
-void mp_setup_code_state(mp_code_state *code_state, mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+void mp_setup_code_state(mp_code_state_t *code_state, mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     // This function is pretty complicated.  It's main aim is to be efficient in speed and RAM
     // usage for the common case of positional only args.
     size_t n_state = code_state->n_state;
diff --git a/py/bc.h b/py/bc.h
index c2d95be..11f5bb6 100644
--- a/py/bc.h
+++ b/py/bc.h
@@ -60,7 +60,7 @@
 //  constN          : obj
 
 // Exception stack entry
-typedef struct _mp_exc_stack {
+typedef struct _mp_exc_stack_t {
     const byte *handler;
     // bit 0 is saved currently_in_except_block value
     // bit 1 is whether the opcode was SETUP_WITH or SETUP_FINALLY
@@ -69,7 +69,7 @@
     mp_obj_base_t *prev_exc;
 } mp_exc_stack_t;
 
-typedef struct _mp_code_state {
+typedef struct _mp_code_state_t {
     const byte *code_info;
     const byte *ip;
     const mp_uint_t *const_table;
@@ -85,14 +85,14 @@
     mp_obj_t state[0];
     // Variable-length, never accessed by name, only as (void*)(state + n_state)
     //mp_exc_stack_t exc_state[0];
-} mp_code_state;
+} mp_code_state_t;
 
 mp_uint_t mp_decode_uint(const byte **ptr);
 
-mp_vm_return_kind_t mp_execute_bytecode(mp_code_state *code_state, volatile mp_obj_t inject_exc);
-mp_code_state *mp_obj_fun_bc_prepare_codestate(mp_obj_t func, size_t n_args, size_t n_kw, const mp_obj_t *args);
+mp_vm_return_kind_t mp_execute_bytecode(mp_code_state_t *code_state, volatile mp_obj_t inject_exc);
+mp_code_state_t *mp_obj_fun_bc_prepare_codestate(mp_obj_t func, size_t n_args, size_t n_kw, const mp_obj_t *args);
 struct _mp_obj_fun_bc_t;
-void mp_setup_code_state(mp_code_state *code_state, struct _mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, const mp_obj_t *args);
+void mp_setup_code_state(mp_code_state_t *code_state, struct _mp_obj_fun_bc_t *self, size_t n_args, size_t n_kw, const mp_obj_t *args);
 void mp_bytecode_print(const void *descr, const byte *code, mp_uint_t len, const mp_uint_t *const_table);
 void mp_bytecode_print2(const byte *code, mp_uint_t len);
 const byte *mp_bytecode_print_str(const byte *ip);
diff --git a/py/emitnative.c b/py/emitnative.c
index 9adaabc..2cf4711 100644
--- a/py/emitnative.c
+++ b/py/emitnative.c
@@ -628,7 +628,7 @@
 STATIC void emit_native_load_fast(emit_t *emit, qstr qst, mp_uint_t local_num);
 STATIC void emit_native_store_fast(emit_t *emit, qstr qst, mp_uint_t local_num);
 
-#define STATE_START (sizeof(mp_code_state) / sizeof(mp_uint_t))
+#define STATE_START (sizeof(mp_code_state_t) / sizeof(mp_uint_t))
 
 STATIC void emit_native_start_pass(emit_t *emit, pass_kind_t pass, scope_t *scope) {
     DEBUG_printf("start_pass(pass=%u, scope=%p)\n", pass, scope);
@@ -775,10 +775,10 @@
 
         // set code_state.ip (offset from start of this function to prelude info)
         // XXX this encoding may change size
-        ASM_MOV_IMM_TO_LOCAL_USING(emit->as, emit->prelude_offset, offsetof(mp_code_state, ip) / sizeof(mp_uint_t), REG_ARG_1);
+        ASM_MOV_IMM_TO_LOCAL_USING(emit->as, emit->prelude_offset, offsetof(mp_code_state_t, ip) / sizeof(mp_uint_t), REG_ARG_1);
 
         // set code_state.n_state
-        ASM_MOV_IMM_TO_LOCAL_USING(emit->as, emit->n_state, offsetof(mp_code_state, n_state) / sizeof(mp_uint_t), REG_ARG_1);
+        ASM_MOV_IMM_TO_LOCAL_USING(emit->as, emit->n_state, offsetof(mp_code_state_t, n_state) / sizeof(mp_uint_t), REG_ARG_1);
 
         // put address of code_state into first arg
         ASM_MOV_LOCAL_ADDR_TO_REG(emit->as, 0, REG_ARG_1);
diff --git a/py/objfun.c b/py/objfun.c
index 293d064..3fd25fb 100644
--- a/py/objfun.c
+++ b/py/objfun.c
@@ -165,7 +165,7 @@
 #define VM_DETECT_STACK_OVERFLOW (0)
 
 #if MICROPY_STACKLESS
-mp_code_state *mp_obj_fun_bc_prepare_codestate(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
+mp_code_state_t *mp_obj_fun_bc_prepare_codestate(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
     MP_STACK_CHECK();
     mp_obj_fun_bc_t *self = MP_OBJ_TO_PTR(self_in);
 
@@ -178,8 +178,8 @@
 
     // allocate state for locals and stack
     size_t state_size = n_state * sizeof(mp_obj_t) + n_exc_stack * sizeof(mp_exc_stack_t);
-    mp_code_state *code_state;
-    code_state = m_new_obj_var_maybe(mp_code_state, byte, state_size);
+    mp_code_state_t *code_state;
+    code_state = m_new_obj_var_maybe(mp_code_state_t, byte, state_size);
     if (!code_state) {
         return NULL;
     }
@@ -220,12 +220,12 @@
 
     // allocate state for locals and stack
     mp_uint_t state_size = n_state * sizeof(mp_obj_t) + n_exc_stack * sizeof(mp_exc_stack_t);
-    mp_code_state *code_state = NULL;
+    mp_code_state_t *code_state = NULL;
     if (state_size > VM_MAX_STATE_ON_STACK) {
-        code_state = m_new_obj_var_maybe(mp_code_state, byte, state_size);
+        code_state = m_new_obj_var_maybe(mp_code_state_t, byte, state_size);
     }
     if (code_state == NULL) {
-        code_state = alloca(sizeof(mp_code_state) + state_size);
+        code_state = alloca(sizeof(mp_code_state_t) + state_size);
         state_size = 0; // indicate that we allocated using alloca
     }
 
@@ -287,7 +287,7 @@
 
     // free the state if it was allocated on the heap
     if (state_size != 0) {
-        m_del_var(mp_code_state, byte, state_size, code_state);
+        m_del_var(mp_code_state_t, byte, state_size, code_state);
     }
 
     if (vm_return_kind == MP_VM_RETURN_NORMAL) {
diff --git a/py/objgenerator.c b/py/objgenerator.c
index 99d9445..8c32a36 100644
--- a/py/objgenerator.c
+++ b/py/objgenerator.c
@@ -46,7 +46,7 @@
 typedef struct _mp_obj_gen_instance_t {
     mp_obj_base_t base;
     mp_obj_dict_t *globals;
-    mp_code_state code_state;
+    mp_code_state_t code_state;
 } mp_obj_gen_instance_t;
 
 STATIC mp_obj_t gen_wrap_call(mp_obj_t self_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
diff --git a/py/vm.c b/py/vm.c
index 6580140..f9bdedf 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -127,7 +127,7 @@
 //  MP_VM_RETURN_NORMAL, sp valid, return value in *sp
 //  MP_VM_RETURN_YIELD, ip, sp valid, yielded value in *sp
 //  MP_VM_RETURN_EXCEPTION, exception in fastn[0]
-mp_vm_return_kind_t mp_execute_bytecode(mp_code_state *code_state, volatile mp_obj_t inject_exc) {
+mp_vm_return_kind_t mp_execute_bytecode(mp_code_state_t *code_state, volatile mp_obj_t inject_exc) {
 #define SELECTIVE_EXC_IP (0)
 #if SELECTIVE_EXC_IP
 #define MARK_EXC_IP_SELECTIVE() { code_state->ip = ip; } /* stores ip 1 byte past last opcode */
@@ -904,7 +904,7 @@
                         code_state->ip = ip;
                         code_state->sp = sp;
                         code_state->exc_sp = MP_TAGPTR_MAKE(exc_sp, currently_in_except_block);
-                        mp_code_state *new_state = mp_obj_fun_bc_prepare_codestate(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1);
+                        mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(*sp, unum & 0xff, (unum >> 8) & 0xff, sp + 1);
                         if (new_state) {
                             new_state->prev = code_state;
                             code_state = new_state;
@@ -940,7 +940,7 @@
                         mp_call_args_t out_args;
                         mp_call_prepare_args_n_kw_var(false, unum, sp, &out_args);
 
-                        mp_code_state *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
+                        mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
                             out_args.n_args, out_args.n_kw, out_args.args);
                         m_del(mp_obj_t, out_args.args, out_args.n_alloc);
                         if (new_state) {
@@ -976,7 +976,7 @@
                         mp_uint_t n_kw = (unum >> 8) & 0xff;
                         int adjust = (sp[1] == MP_OBJ_NULL) ? 0 : 1;
 
-                        mp_code_state *new_state = mp_obj_fun_bc_prepare_codestate(*sp, n_args + adjust, n_kw, sp + 2 - adjust);
+                        mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(*sp, n_args + adjust, n_kw, sp + 2 - adjust);
                         if (new_state) {
                             new_state->prev = code_state;
                             code_state = new_state;
@@ -1011,7 +1011,7 @@
                         mp_call_args_t out_args;
                         mp_call_prepare_args_n_kw_var(true, unum, sp, &out_args);
 
-                        mp_code_state *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
+                        mp_code_state_t *new_state = mp_obj_fun_bc_prepare_codestate(out_args.fun,
                             out_args.n_args, out_args.n_kw, out_args.args);
                         m_del(mp_obj_t, out_args.args, out_args.n_alloc);
                         if (new_state) {