Reland "Add initial support for compiler unit tests using GTest/GMock.".

LOG=y
BUG=v8:3489
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/457503002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22987 ce2b1a6d-e550-0410-aec6-3dcde31c8c00