[InstCombine][NFC] Add tests for masked merge folding.
https://bugs.llvm.org/show_bug.cgi?id=6773 As discussed there, some backends may want to undo this fold (x86+bmi for scalars, x86+sse for vectors, ...) https://bugs.llvm.org/show_bug.cgi?id=37104 https://rise4fun.com/Alive/JXt llvm-svn: 330003
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