[llvm] [X86][SimplifyCFG][CodeGen] Support hoisting load/store with conditional faulting (PR #95515)

[Shengchen Kan via llvm-commits]

KanRobert wrote:

> Added some reviewers that are probably better suited to the SimplifyCFG part of this (which it would be nice if we could split into an independent PR).

Prefer to to keep it together b/c the design in middle-end determines how we build DAG nodes in backend. I'd like they can co-work together.

https://github.com/llvm/llvm-project/pull/95515