Merged r15679 into trunk branch.

Disable compiled_transitions by default.

R=jkummerow@chromium.org
BUG=chromium:260585

Review URL: https://codereview.chromium.org/19266011

git-svn-id: https://v8.googlecode.com/svn/trunk@15688 ce2b1a6d-e550-0410-aec6-3dcde31c8c00