[LoopStrengthReduce] Don't bother fixing up PHIs from EH Pad preds

We cannot really insert fixup code into a PHI's predecessor.

This fixes PR25445.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252416 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed