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

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

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

This is a generalization of 4069cccf 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.

Differential Revision: https://reviews.llvm.org/D126171