Flattened the representation of compiled RegExp data.

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 66ca97ef42fbe7a78e061d8a2e3e53167e86ad60..da331c2df77f388dad959da662c8ccb7b584fffc 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -2337,6 +2337,13 @@ Object* JSRegExp::DataAt(int index) {
 }
 
 
+void JSRegExp::SetDataAt(int index, Object* value) {
+  ASSERT(TypeTag() != NOT_COMPILED);
+  ASSERT(index >= kDataIndex);  // Only implementation data can be set this way.
+  FixedArray::cast(data())->set(index, value);
+}
+
+
 bool JSObject::HasFastElements() {
   return !elements()->IsDictionary();
 }