ES6 symbols: Implement Symbol intrinsic and basic functionality

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index 427e27dfe1945c817bc09d1864037322cd67f3a5..7a2d04fb171fc3838dd6e35603aa7d20017c3431 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -788,9 +788,9 @@ class ICCompareStub: public PlatformCodeStub {
 
  private:
   class OpField: public BitField<int, 0, 3> { };
-  class LeftStateField: public BitField<int, 3, 3> { };
-  class RightStateField: public BitField<int, 6, 3> { };
-  class HandlerStateField: public BitField<int, 9, 3> { };
+  class LeftStateField: public BitField<int, 3, 4> { };
+  class RightStateField: public BitField<int, 7, 4> { };
+  class HandlerStateField: public BitField<int, 11, 4> { };
 
   virtual void FinishCode(Handle<Code> code) {
     code->set_stub_info(MinorKey());
@@ -805,6 +805,7 @@ class ICCompareStub: public PlatformCodeStub {
   void GenerateHeapNumbers(MacroAssembler* masm);
   void GenerateInternalizedStrings(MacroAssembler* masm);
   void GenerateStrings(MacroAssembler* masm);
+  void GenerateUniqueNames(MacroAssembler* masm);
   void GenerateObjects(MacroAssembler* masm);
   void GenerateMiss(MacroAssembler* masm);
   void GenerateKnownObjects(MacroAssembler* masm);