The new target called "quickcheck" builds and tests with several configurations using recent test runner speed improvements.

Runtime from scratch (after make clean): < 8 min
Runtime tests only: < 3 min

TEST=make quickcheck
R=jkummerow@chromium.org, yangguo@chromium.org

Review URL: https://codereview.chromium.org/94703002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18120 ce2b1a6d-e550-0410-aec6-3dcde31c8c00