Fixed lazy parsing heuristics to respect outer scope. (Chromium issue 135008)

Allow using test-wrapper-gypbuild.py on Windows when no python interpreter is registered.

Performance and stability improvements on all platforms.

git-svn-id: http://v8.googlecode.com/svn/trunk@11947 ce2b1a6d-e550-0410-aec6-3dcde31c8c00