Remove TLS load in regexp code.

Spotted while reviewing Yang's patch.

R=yangguo@chromium.org

Review URL: http://codereview.chromium.org/7585005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8846 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/jsregexp.cc

@@ -267,7 +267,7 @@ Handle<Object> RegExpImpl::AtomExec(Handle<JSRegExp> re,
                                seq_sub->ToUC16Vector(),
                                needle->ToUC16Vector(),
                                index)));
-    if (index == -1) return FACTORY->null_value();
+    if (index == -1) return isolate->factory()->null_value();
   }
   ASSERT(last_match_info->HasFastElements());