[NFC][InstCombine] Better commutative tests for "shift amount reassociation in bittest" pattern.
As discussed in https://reviews.llvm.org/D63829 *if* *both* shifts are one-use, we'd most likely want to produce `lshr`, and not rely on ordering. Also, there should likely be a *separate* fold to do this reordering. llvm-svn: 364772
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