[llvm] [DFAJumpThreading] Handle select unfolding when user phi is not a dir… (PR #109511)

[Mikael Holmén via llvm-commits]

mikaelholmen wrote:

I've confirmed that this patch makes the crash I reported in
 https://github.com/llvm/llvm-project/pull/96127#issuecomment-2303862037
go away.

The one I reported in
 https://github.com/llvm/llvm-project/pull/96127#issuecomment-2324800391
still crashes with the patch.

https://github.com/llvm/llvm-project/pull/109511