Update V8 to version 1.2.4.2.
Update V8 to version 1.2.4.2.

This new version only contains two minor changes:

Fix for problem with newer gcc versions.

Exposing an API to get the context of the calling JavaScript code.

Review URL: http://codereview.chromium.org/113632

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@16472 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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