[NFC][InstCombine] Revisit canonicalize-constant-low-bit-mask-and-icmp-s* tests in preparatio for PR42198.
The `icmp sgt`/`icmp sle` variants are, too, miscompiles:
https://rise4fun.com/Alive/JFNP
https://rise4fun.com/Alive/jHvL
A precondition 'x != 0' was forgotten by me.
While ensuring test coverage for `-1`, also add test coverage
for `0` mask. Mask `0` is allowed for all the folds,
mask `-1` is allowed for all the folds with unsigned `icmp` pred.
Constant mask `0` is missed though.
https://bugs.llvm.org/show_bug.cgi?id=42198
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@362910
91177308-0d34-0410-b5e6-
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