[PATCH] D126171: [InstCombine] fold icmp of zext bool based on limited range

[Sanjay Patel via Phabricator via llvm-commits]

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Op0 <u (zext i1 X) --> Op0 == 0 && X

https://alive2.llvm.org/ce/z/avQDRY

This is a generalization of 4069cccf3b4ff4a <https://reviews.llvm.org/rG4069cccf3b4ff4afb743d3d371ead9e2d5491e3a> based on the post-commit suggestion. 
This also adds the i1 type check and tests that were missing from the earlier attempt; that commit caused several bot fails and was reverted.


https://reviews.llvm.org/D126171

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
  llvm/test/Transforms/InstCombine/icmp-range.ll

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