Fix issue 263:

Fix issue 263:

http://code.google.com/p/v8/issues/detail?id=263

Sharing the code to unlink the exception handler for a try/finally
causes us to try to merge virtual frames with different heights (due
to statements that keep state on the stack) at the entry to the unlink
code.

Avoid this by unlinking the handler separately for each exit from the
try block.
Review URL: http://codereview.chromium.org/39331

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1449 ce2b1a6d-e550-0410-aec6-3dcde31c8c00