Joshua Cao cb9f1aadda [ValueTracking] Implied conditions for lshr ...

`V1 >> V2 u<= V1` for any V1, V2

This works for lshr and any div's that are changed to lshr's

This fixes issues in clang and rustc:
https://github.com/llvm/llvm-project/issues/62441
https://github.com/rust-lang/rust/issues/110971

Reviewed By: goldstein.w.n

Differential Revision: https://reviews.llvm.org/D151541

2023-06-06 21:06:22 -07:00

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