Consistently use CHECK_ALIVE_OR_RETURN in graph builder.

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/23819026

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16562 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove obsolete global V8::has_been_fooed flags.

R=yangguo@chromium.org
BUG=v8:2744
TEST=cctest/test-api/InitializeAndDispose

Review URL: https://codereview.chromium.org/23453030

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16563 ce2b1a6d-e550-0410-aec6-3dcde31c8c00