revert rL344609: [InstCombine] try harder to form select from logic ops

I noticed a missing check and added it at rL344610, but there actually
are codegen tests that will fail without that, so I'll edit those and
submit a fixed patch with more tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344612 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed