Improve performance of Error.stack when stack contains local functions. 
Improve performance of Error.stack when stack contains local functions. 

BUG=http://crbug.com/53303
TEST=Use the test case attached in the bug report.

Patch by Xianzhu Wang <wangxianzhu@google.com>

Review URL: http://codereview.chromium.org/3167042


git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@5410 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh