Externalize deoptimization reasons.

src/arm64/assembler-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
@@ skipping 3059 matching lines @@
 
 
 void Assembler::RecordComment(const char* msg) {
   if (FLAG_code_comments) {
     CheckBuffer();
     RecordRelocInfo(RelocInfo::COMMENT, reinterpret_cast<intptr_t>(msg));
   }
 }
 
 
+void Assembler::RecordDeoptReason(const int reason, const int raw_position) {
+  if (FLAG_trace_deopt) {
+    EnsureSpace ensure_space(this);
+    RecordRelocInfo(RelocInfo::POSITION, raw_position);
+    RecordRelocInfo(RelocInfo::DEOPT_REASON, reason);
+  }
+}
+
+
 int Assembler::buffer_space() const {
   return reloc_info_writer.pos() - reinterpret_cast<byte*>(pc_);
 }
 
 
 void Assembler::RecordJSReturn() {
   positions_recorder()->WriteRecordedPositions();
   CheckBuffer();
   RecordRelocInfo(RelocInfo::JS_RETURN);
 }
@@ skipping 56 matching lines @@
   movz(scratch, (target_offset >> 16) & 0xFFFF, 16);
   movk(scratch, (target_offset >> 32) & 0xFFFF, 32);
   DCHECK((target_offset >> 48) == 0);
   add(rd, rd, scratch);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64