[llvm] [InstSimplify] Handle trunc to i1 in Select with bit test folds. (PR #122944)

[Andreas Jonson via llvm-commits]

andjo403 wrote:

when I did the analysis in https://github.com/llvm/llvm-project/pull/119196#issuecomment-2573964538 I only searched in the code after folds with the bit test pattern I did not test if any of the patterns happen in llvm-opt-benchmark, but maybe possible that some of the other folds will result in this pattern.

https://github.com/llvm/llvm-project/pull/122944