[PowerPC] Compute the MMO offset for an unaligned load with signed arithmetic
If you compute the MMO offset using unsigned arithmetic, you end up with a
large positive offset instead of a small negative one. In theory, this could
cause bad instruction-scheduling decisions later.
I noticed this by inspection from the debug output, and using that for the
regression test is the best I can do right now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@246805
91177308-0d34-0410-b5e6-
96231b3b80d8