Fix dependency of loading the heap-number for a double-field store to be the mapcheck.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 685a5e883cd4085e231cd2d2b2f99c9a8f863dde..d5b1c75ebf8b7f87bffd705e7c3a2dce999229ed 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -5599,7 +5599,6 @@ class HLoadNamedField V8_FINAL : public HTemplateInstruction<1> {
 
   HValue* object() { return OperandAt(0); }
   bool HasTypeCheck() { return object()->IsCheckMaps(); }
-  void ClearTypeCheck() { SetOperandAt(0, object()->ActualValue()); }
   HObjectAccess access() const { return access_; }
   Representation field_representation() const {
       return access_.representation();