Add support for sdiv by 2^k and -2^k.  Producing code like:

_test:
        srawi r2, r3, 2
        addze r3, r2
        blr


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23052 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed