[Coroutines] Should the AllocaUseVisitor call handleAlias for more instruction types?

In https://github.com/llvm/llvm-project/pull/156788 the AllocaUseVisitor was updated to call handleAlias for InsertElement and InsertValue instructions to fix https://github.com/llvm/llvm-project/issues/149604

It's not clear to me why the fix is just to handle those two instructions, and not others. There was some discussion about this afterwards: https://github.com/llvm/llvm-project/pull/156788#issuecomment-3284362355

This bug tracks following up on that properly.

Start by reading AllocaUseVisitor and handleAlias, then review PR 156788 and its linked discussion to understand why InsertElement and InsertValue were added. Identify which other instruction types need equivalent handling and use the regression context from issue 149604 to define and verify the complete fix.

Written by the indexing model from the issue text.