Clean up code stubs and ensure distinct major keys.

src/ia32/code-stubs-ia32.h

Index: src/ia32/code-stubs-ia32.h
diff --git a/src/ia32/code-stubs-ia32.h b/src/ia32/code-stubs-ia32.h
index 1e5c6cc3b6a1f539478789d0fed3c4f209a2a7ae..5cc55dd65c7f5c0e608b4ec54dcacf20eff88a79 100644
--- a/src/ia32/code-stubs-ia32.h
+++ b/src/ia32/code-stubs-ia32.h
@@ -114,7 +114,7 @@ class NameDictionaryLookupStub: public PlatformCodeStub {
       NameDictionary::kHeaderSize +
       NameDictionary::kElementsStartIndex * kPointerSize;
 
-  Major MajorKey() const { return NameDictionaryLookup; }
+  virtual inline Major MajorKey() const FINAL OVERRIDE;
 
   Register dictionary() const {
     return Register::from_code(DictionaryBits::decode(minor_key_));
@@ -359,7 +359,7 @@ class RecordWriteStub: public PlatformCodeStub {
     kUpdateRememberedSetOnNoNeedToInformIncrementalMarker
   };
 
-  Major MajorKey() const { return RecordWrite; }
+  virtual inline Major MajorKey() const FINAL OVERRIDE;
 
   void Generate(MacroAssembler* masm);
   void GenerateIncremental(MacroAssembler* masm, Mode mode);