Collect garbage at the beginning of cctest/test-cpu-profiler/FunctionCallSample

That way, we don't end up collecting all samples in the garbage
collector when the i18n extension is loaded.

BUG=v8:2745
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18714006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15547 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Introduce a handle zapping setting, and enable it by default for release and debug

The checks are split out from "extra checks" which are too expensive to
turn on by default.

R=danno@chromium.org

Review URL: https://codereview.chromium.org/18316006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15548 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Widen existing blink test expectations for Windows debug.

All three tests have existing timing issues on the blink waterfall and receive a timeout on the V8 waterfall in Windows debug.

See http://src.chromium.org/viewvc/blink/trunk/LayoutTests/TestExpectations

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/18434005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15549 ce2b1a6d-e550-0410-aec6-3dcde31c8c00