56b3222b79
Remove the canonicalization of `trunc` to `i1` according to the
suggestion of
https://github.com/llvm/llvm-project/pull/83829#issuecomment-1986801166
a84e66a92d/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp (L737-L745)
Alive2: https://alive2.llvm.org/ce/z/cacYVA