[llvm] [CoroSplit] AllocaUseVisitor visits insertvalue/insertelement (PR #156788)

[Hans Wennborg via llvm-commits]

zmodem wrote:

But wasn't insertvalue/insertelement also already handled by PtrUseVisitor (via its base, InstVisitor). Why do they need special handling (handleAlias) and for example ptrtoint doesn't?

https://github.com/llvm/llvm-project/pull/156788