Remove all uses of field-tracking flags that do not make decisions but are subject to existing info…

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 927 matching lines @@
 
   virtual Code::StubType GetStubType() { return Code::FAST; }
 
  protected:
   LoadFieldStub() : HandlerStub() { }
 
   void Initialize(Code::Kind kind,
                   bool inobject,
                   int index,
                   Representation representation) {
-    bool unboxed_double = FLAG_track_double_fields && representation.IsDouble();
     bit_field_ = KindBits::encode(kind)
         | InobjectBits::encode(inobject)
         | IndexBits::encode(index)
-        | UnboxedDoubleBits::encode(unboxed_double);
+        | UnboxedDoubleBits::encode(representation.IsDouble());
   }
 
  private:
   STATIC_ASSERT(KindBits::kSize == 4);
   class InobjectBits: public BitField<bool, 4, 1> {};
   class IndexBits: public BitField<int, 5, 11> {};
   class UnboxedDoubleBits: public BitField<bool, 16, 1> {};
   virtual CodeStub::Major MajorKey() { return LoadField; }
 };
 
@@ skipping 1515 matching lines @@
 
 
 class CallDescriptors {
  public:
   static void InitializeForIsolate(Isolate* isolate);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_