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* Reimplementation of FunctionStub to avoid rewriting potentially executing ↵siggi@chromium.org2010-03-231-0/+141
code for a slight improvement in thread safety. Make VTABLE patching treadsafe to the extent possible. As-is it's now safe against itself running on other threads at lease, as well as against other similar implementations, though the inherent VM operation race is resolved by retrying. BUG=27415 TEST=Included unittests. Review URL: http://codereview.chromium.org/992008 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42381 0039d316-1c4b-4281-b951-d872f2087c98