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

[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.

llvm-svn: 299834