Rebaseline webkit test with correct assumptions.

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/20691002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15901 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Lazy call to custom stack trace formatting using Error.prepareStackTrace.

This enables custom stack trace formatting for stack overflow.
A consequence is that stack trace formatting is now easily observable,
but we already established that the default stack trace formatting can
be observed anyways. It is only triggered by the .stack getter, and
it has to be explicitly called, (e.g. not implicitly after GC).

R=mstarzinger@chromium.org
BUG=v8:2559

Review URL: https://codereview.chromium.org/20692002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15902 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Regression test for existing bug in String::MakeExternal.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/20713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15903 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add webkit tests to deopt fuzzer portfolio.

Two failing tests are skipped and added to an existing bug report.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/20708002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15904 ce2b1a6d-e550-0410-aec6-3dcde31c8c00