(Note that register "Y" is essentially just ASR0). Also added some test cases for divide and multiply, which had none before. Differential Revision: http://reviews.llvm.org/D8670 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237580 91177308-0d34-0410-b5e6-96231b3b80d8