[llvm] [SimplifyCFG] Select the first instruction that we can handle in `passingValueIsAlwaysUndefined` (PR #98802)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

IR diff LGTM. I am running compile-time tests :)

BTW, I think most of dead blocks are created by JumpThreading. Can we avoid this to further improve compilation time?


https://github.com/llvm/llvm-project/pull/98802