Give sparcv9 the ability to set the target cpu. Change it from accepting
-march which doesnt exist on sparc gcc to -mcpu. While here adjust a
few tests to not write an unused temporary file.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202177 91177308-0d34-0410-b5e6-96231b3b80d8