[llvm] [HashRecognize] Recognize trunc-to-i1 little-endian bit check (PR #213883)

[Ramkumar Ramachandra via llvm-commits]

artagnon wrote:

> Should this wait until that PR is looked at? Or do we still consider this a worthwhile change on its own because `trunc to i1` is now the established canonical form?

I think both PRs (including the llvm-test-suite change) are good to land, without waiting for https://github.com/llvm/llvm-project/pull/213882, thanks.

https://github.com/llvm/llvm-project/pull/213883