Force a cpu for test. It failed on atom due to different scheduling decisions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175401 91177308-0d34-0410-b5e6-96231b3b80d8
Return false instead of 0.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175402 91177308-0d34-0410-b5e6-96231b3b80d8