Externalize deoptimization reasons.

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index 2ebae3bbe02a58348dfd0e9289a46e6a4e0d46ff..b973495bfae08f81aeffd9812952f703717a1693 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1330,6 +1330,10 @@ class Assembler : public AssemblerBase {
   // Use --code-comments to enable.
   void RecordComment(const char* msg, bool force = false);
 
+  // Record a deoptimization reason that can be used by a log or cpu profiler.
+  // Use --trace-deopt to enable.
+  void RecordDeoptReason(const int reason, const int raw_position);
+
   // Allocate a constant pool of the correct size for the generated code.
   Handle<ConstantPoolArray> NewConstantPool(Isolate* isolate);