[DAGCombiner] Dropped explicit (sra 0, x) -> 0 and (sra -1, x) -> 0 folds.
These are both handled (and tested) by the earlier ComputeNumSignBits == EltSizeInBits fold. llvm-svn: 302651
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These are both handled (and tested) by the earlier ComputeNumSignBits == EltSizeInBits fold. llvm-svn: 302651