Move ARM64 macros to macro-assembler-arm64.h.

src/arm64/macro-assembler-arm64.h

Index: src/arm64/macro-assembler-arm64.h
diff --git a/src/arm64/macro-assembler-arm64.h b/src/arm64/macro-assembler-arm64.h
index 4092a27a641b75abc54e7153fc8d26b9283c1751..efb6bcfd4c6320c179ff1f5723768b0eba6b3901 100644
--- a/src/arm64/macro-assembler-arm64.h
+++ b/src/arm64/macro-assembler-arm64.h
@@ -11,6 +11,24 @@
 
 #include "src/arm64/assembler-arm64-inl.h"
 
+// Simulator specific helpers.
+#if USE_SIMULATOR
+  // TODO(all): If possible automatically prepend an indicator like
+  // UNIMPLEMENTED or LOCATION.
+  #define ASM_UNIMPLEMENTED(message)                                         \
+  __ Debug(message, __LINE__, NO_PARAM)
+  #define ASM_UNIMPLEMENTED_BREAK(message)                                   \
+  __ Debug(message, __LINE__,                                                \
+           FLAG_ignore_asm_unimplemented_break ? NO_PARAM : BREAK)
+  #define ASM_LOCATION(message)                                              \
+  __ Debug("LOCATION: " message, __LINE__, NO_PARAM)
+#else
+  #define ASM_UNIMPLEMENTED(message)
+  #define ASM_UNIMPLEMENTED_BREAK(message)
+  #define ASM_LOCATION(message)
+#endif
+
+
 namespace v8 {
 namespace internal {