Remove the strict-mode flag from store handlers. It's only relevant to the IC stub.

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 940 matching lines @@
   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; }
 };
 
 
 class StoreGlobalStub : public HandlerStub {
  public:
-  StoreGlobalStub(StrictModeFlag strict_mode, bool is_constant) {
-    bit_field_ = StrictModeBits::encode(strict_mode) |
-        IsConstantBits::encode(is_constant);
+  explicit StoreGlobalStub(bool is_constant) {
+    bit_field_ = IsConstantBits::encode(is_constant);
   }
 
   Handle<Code> GetCodeCopyFromTemplate(Isolate* isolate,
                                        Map* receiver_map,
                                        PropertyCell* cell) {
     Handle<Code> code = CodeStub::GetCodeCopyFromTemplate(isolate);
     // Replace the placeholder cell and global object map with the actual global
     // cell and receiver map.
     Map* cell_map = isolate->heap()->global_property_cell_map();
     code->ReplaceNthObject(1, cell_map, cell);
@@ skipping 22 matching lines @@
     return Representation::FromKind(RepresentationBits::decode(bit_field_));
   }
   void set_representation(Representation r) {
     bit_field_ = RepresentationBits::update(bit_field_, r.kind());
   }
 
  private:
   virtual int NotMissMinorKey() { return GetExtraICState(); }
   Major MajorKey() { return StoreGlobal; }
 
-  class StrictModeBits: public BitField<StrictModeFlag, 0, 1> {};
-  class IsConstantBits: public BitField<bool, 1, 1> {};
-  class RepresentationBits: public BitField<Representation::Kind, 2, 8> {};
+  class IsConstantBits: public BitField<bool, 0, 1> {};
+  class RepresentationBits: public BitField<Representation::Kind, 1, 8> {};
 
   int bit_field_;
 
   DISALLOW_COPY_AND_ASSIGN(StoreGlobalStub);
 };
 
 
 class KeyedLoadFieldStub: public LoadFieldStub {
  public:
   KeyedLoadFieldStub(bool inobject, int index, Representation representation)
@@ skipping 1495 matching lines @@
   int MinorKey() { return 0; }
 
   void Generate(MacroAssembler* masm);
 
   DISALLOW_COPY_AND_ASSIGN(ProfileEntryHookStub);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_