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

[via llvm-commits]

vporpo wrote:

Ah yes, we have not added any of the transaction tracking code yet, so the IR will currently delegate everything down to LLVM IR. Once we add the tracking code all these functions that modify the IR's state, like RAUW, setOperand, moveBefore etc. will include code that tracks the state change. The first patches that will add some of this functionality are a couple of patches down the road.

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