[llvm] Make RAUW skip instances where operand is the replacement node (PR #212724)

[Soham Karandikar via llvm-commits]

skadewdl3 wrote:

@RKSimon Could you take a look at the `ReplaceAllUsesOfValueExceptSelfWith` approach. I added an optional `SkipSelfReplacement` argument to `makeEquivalentMemoryOrdering` which defaults the false, so we don't need to update every call site.

https://github.com/llvm/llvm-project/pull/212724