Work around a clang-format bug.

Change-Id: Iae451d3f1afa7cf9a44caa1eebf098a0ce9da58e
diff --git a/src/a64/constants-a64.h b/src/a64/constants-a64.h
index ff636ce..4b15aef 100644
--- a/src/a64/constants-a64.h
+++ b/src/a64/constants-a64.h
@@ -47,7 +47,6 @@
 R(8)  R(9)  R(10) R(11) R(12) R(13) R(14) R(15)                                \
 R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23)                                \
 R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31)
-// clang-format on
 
 #define INSTRUCTION_FIELDS_LIST(V_)                        \
   /* Register fields */                                    \
@@ -167,6 +166,7 @@
   V_(ImmNEONImmhImmb, 22, 16, Bits)                        \
   V_(ImmNEONImmh, 22, 19, Bits)                            \
   V_(ImmNEONImmb, 18, 16, Bits)
+// clang-format on
 
 #define SYSTEM_REGISTER_FIELDS_LIST(V_, M_) \
   /* NZCV */                                \