Track representations of fields

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 3381a5b7b6cd0d2d3997451a162bb01eb91d008d..751b421216797c5e54ba802fcfc311a62c3dfac8 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -168,6 +168,10 @@ class MacroAssembler: public Assembler {
                      Label* condition_met,
                      Label::Distance condition_met_distance = Label::kFar);
 
+  void CheckMapDeprecated(Handle<Map> map,
+                          Register scratch,
+                          Label* if_deprecated);
+
   // Check if object is in new space.  Jumps if the object is not in new space.
   // The register scratch can be object itself, but scratch will be clobbered.
   void JumpIfNotInNewSpace(Register object,