[llvm] [X86, SimplifyCFG] Support hoisting load/store with conditional faulting (Part I) (PR #96878)

[Shengchen Kan via llvm-commits]

KanRobert wrote:

@nikic @DianQK Passed the validation of CPU2017/2006 && llvm-test-suite && geekbench after moving the transform into middle-end.

https://github.com/llvm/llvm-project/pull/96878