[llvm] [InstCombine] Fold `(trunc X)` into `X & Mask` inside `decomposeBitTestICmp` (PR #171195)

[Tirthankar Mazumder via llvm-commits]

wermos wrote:

That was the last changed file, and here's the corresponding Alive2 link: https://alive2.llvm.org/ce/z/9YZQRd

https://github.com/llvm/llvm-project/pull/171195