Add support for AXFLAG and XAFLAG instructions.

Change-Id: I95867fa8adb6eeefe49dc5e0f56ed51b4d060a1d
diff --git a/src/cpu-features.h b/src/cpu-features.h
index 88b6914..fffef44 100644
--- a/src/cpu-features.h
+++ b/src/cpu-features.h
@@ -96,7 +96,9 @@
   /* Data-independent timing (for selected instructions).                   */ \
   V(kDIT,                 "DIT",                    "dit")                     \
   /* Branch target identification.                                          */ \
-  V(kBTI,                 "BTI",                    NULL)
+  V(kBTI,                 "BTI",                    NULL)                      \
+  /* Flag manipulation instructions: {AX,XA}FLAG                            */ \
+  V(kAXFlag,              "AXFlag",                 NULL)
 // clang-format on