Check forwarding pointer when marking objects for deoptimization.

BUG=
R=bmeurer@chromium.org, mvstanton@chromium.org

Review URL: https://codereview.chromium.org/148493004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18973 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix python path for gyp.

BUG=
R=jochen@chromium.org

Review URL: https://codereview.chromium.org/151253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18974 ce2b1a6d-e550-0410-aec6-3dcde31c8c00