[ValueTracking] Add `shl nsw %val, %cnt != 0` if `%val != 0`.
Alive2 Link: https://alive2.llvm.org/ce/z/mxZLJn Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D147898
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Alive2 Link: https://alive2.llvm.org/ce/z/mxZLJn Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D147898