Fix several bugs in error stack trace formatting.

Fix several bugs in error stack trace formatting.

GetScriptWrapper can be called recursively:
GetScriptWrapper -> GC -> DeferredFormatStackTrace -> GetScriptWrapper

GC-unsafe code in ErrorObjectList::DeferredFormatStackTrace

Enable overwriting Error.prepareStackTrace by itself while not
causing infinity recursion when it triggers an exception.

R=ulan@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=13256

[ulan, 2012-12-20 16:23:38]

lgtm