[llvm] [SandboxIR] Add setOperand() and RAUW,RUWIf,RUOW (PR #98410)

[via llvm-commits]

vporpo wrote:

OK I will update this patch with some comments and I will follow up with another one that adds these comments to the remaining functions. 
So just to confirm, you would like to see comments in the declaration of functions like `sandboxir::Value::repalceAllUsesWith()` that look like: `Delegate for Value::replaceAllUsesWith()`.

The assumption is that all SandboxIR functions with the same name as the corresponding LLVM IR function is almost always a delegate, but yeah clarifying that is always helpful.

https://github.com/llvm/llvm-project/pull/98410