[InstCombine] Make the (A|B)^B -> A & ~B transform code consistent with the very...

[InstCombine] Make the (A|B)^B -> A & ~B transform code consistent with the very similar (A&B)^B -> ~A & B code. This should be NFC except for the addition of hasOneUse check.

I think this code is still overly complicated and should use matchers, but first I wanted to make it consistent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299834 91177308-0d34-0410-b5e6-96231b3b80d8