Externalize deoptimization reasons.

src/x64/assembler-x64.cc

Index: src/x64/assembler-x64.cc
diff --git a/src/x64/assembler-x64.cc b/src/x64/assembler-x64.cc
index 725dcdb5bde69e551ceecee460c4236118af405d..355996458cf70a163fc919f9cd7575e48e56ace1 100644
--- a/src/x64/assembler-x64.cc
+++ b/src/x64/assembler-x64.cc
@@ -3386,6 +3386,15 @@ void Assembler::RecordComment(const char* msg, bool force) {
 }
 
 
+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);
+  }
+}
+
+
 Handle<ConstantPoolArray> Assembler::NewConstantPool(Isolate* isolate) {
   // No out-of-line constant pool support.
   DCHECK(!FLAG_enable_ool_constant_pool);