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

[Hans Wennborg via llvm-commits]

zmodem wrote:

I'm not familiar with `AllocaUseVisitor` and `handleAlias()`, but how do we know that we're not missing other `visit` functions?

It's not clear to me what criteria is used to decide which instructions need a `visit` function and call to `handleAlias()`, and which do not.

For example, I noticed that `visitPtrToIntInst()` isn't implemented. Couldn't an alloca escape through that too?

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