Separate native and interpreted regexp by compile time flag, not runtime.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 378314e2014f4b2b7599841b0b7658b2acfb5a96..057421a7c34b37bc851bff90b9d6baa53eaed17c 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1593,11 +1593,13 @@ class JSObject: public HeapObject {
 
   void LookupInDescriptor(String* name, LookupResult* result);
 
-  // Attempts to get property with a named interceptor getter.
-  // Sets |attributes| to ABSENT if interceptor didn't return anything
-  Object* GetPropertyWithInterceptorProper(JSObject* receiver,
-                                           String* name,
-                                           PropertyAttributes* attributes);
+  // Attempts to get property with a named interceptor getter.  Returns
+  // |true| and stores result into |result| if succesful, otherwise
+  // returns |false|
+  bool GetPropertyWithInterceptorProper(JSObject* receiver,
+                                        String* name,
+                                        PropertyAttributes* attributes,
+                                        Object** result);
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSObject);
 };
@@ -3270,6 +3272,9 @@ class JSRegExp: public JSObject {
   inline Object* DataAt(int index);
   // Set implementation data after the object has been prepared.
   inline void SetDataAt(int index, Object* value);
+  static int code_index(bool is_ascii) {
+    return is_ascii ? kIrregexpASCIICodeIndex : kIrregexpUC16CodeIndex;
+  }
 
   static inline JSRegExp* cast(Object* obj);