And while we are at it, use the stupid MSVC compiler intrinsics.

TEST=base-unittests/BitTest
TBR=jarin@chromium.org

Review URL: https://codereview.chromium.org/473773003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23123 ce2b1a6d-e550-0410-aec6-3dcde31c8c00