[ValueTracking] Improve isKnowNonZero for Ints
Improve isKnownNonZero for integers in order to improve cttz optimizations. Differential Revision: https://reviews.llvm.org/D60846 llvm-svn: 360222
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Improve isKnownNonZero for integers in order to improve cttz optimizations. Differential Revision: https://reviews.llvm.org/D60846 llvm-svn: 360222