Fix embedded new-space pointer in LCmpObjectEqAndBranch.

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 bbbfdb0ab52ca75447360b0cb859caca9298c623..9cc496f8c2dd13b3e0c4328724bf202f2f762bc8 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -788,6 +788,7 @@ class MacroAssembler: public Assembler {
   // Load a heap object and handle the case of new-space objects by
   // indirecting via a global cell.
   void LoadHeapObject(Register result, Handle<HeapObject> object);
+  void CmpHeapObject(Register reg, Handle<HeapObject> object);
   void PushHeapObject(Handle<HeapObject> object);
 
   void LoadObject(Register result, Handle<Object> object) {
@@ -799,6 +800,15 @@ class MacroAssembler: public Assembler {
     }
   }
 
+  void CmpObject(Register reg, Handle<Object> object) {
+    ALLOW_HANDLE_DEREF(isolate(), "heap object check");
+    if (object->IsHeapObject()) {
+      CmpHeapObject(reg, Handle<HeapObject>::cast(object));
+    } else {
+      Cmp(reg, object);
+    }
+  }
+
   // Load a global cell into a register.
   void LoadGlobalCell(Register dst, Handle<JSGlobalPropertyCell> cell);