Add max optimization flag to v8 gyp build to ensure V8 is always built  fully optimized in Chrome.

MIPS: Bring MIPS to parity with other platforms.

Optimizations and stability improvements on all platforms.

Review URL: http://codereview.chromium.org/9020006

git-svn-id: http://v8.googlecode.com/svn/trunk@10288 ce2b1a6d-e550-0410-aec6-3dcde31c8c00