Make Value::IsUndefined and Value::IsNull inlineable.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d682cde0f81cb0a4edd5d86b5903fccfad8f17b3..80d1fd47d02ab60dd015704d7836b20bf9b9189a 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -680,6 +680,7 @@ const int kExternalArrayTypeCount =
 
 STATIC_CHECK(JS_OBJECT_TYPE == Internals::kJSObjectType);
 STATIC_CHECK(FIRST_NONSTRING_TYPE == Internals::kFirstNonstringType);
+STATIC_CHECK(ODDBALL_TYPE == Internals::kOddballType);
 STATIC_CHECK(FOREIGN_TYPE == Internals::kForeignType);
 
 
@@ -7636,6 +7637,10 @@ class Oddball: public HeapObject {
                               kToNumberOffset + kPointerSize,
                               kSize> BodyDescriptor;
 
+  STATIC_CHECK(kKindOffset == Internals::kOddballKindOffset);
+  STATIC_CHECK(kNull == Internals::kNullOddballKind);
+  STATIC_CHECK(kUndefined == Internals::kUndefinedOddballKind);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Oddball);
 };