[InstCombine][NFC] masked-merge: add 'and' tests, too.
(and plain 'or', for completeness sake.)
After submitting D45631, i have realized that it will *already*
affect 'and' pattern, and it was obvious that there were no
good test patterns to show that.
Since the masked-merge.ll is getting kinda big,
unify naming schemes a bit, and split into 'xor'/'and'/'or'
testfiles, with the only difference being the last operation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330072
91177308-0d34-0410-b5e6-
96231b3b80d8
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