[clang] [clang][bytecode] Add InitLinkScope for temporary variables (PR #106552)

[Timm Baeder via cfe-commits]

tbaederr wrote:

@AaronBallman Can you confirm whether the following behavior is correct?

When a `CXXDefaultInitExpr` is the child node of an `InitListExpr`, all `CXXThisExpr` found within that `CXXDefaultInitExpr` point to the `InitListExpr` and not to the actual instance pointer of the current stack frame. 

To properly implement this, I'd need to create a temporary variable whenever I encounter a `InitListExpr` though, which I'd like to avoid.

https://github.com/llvm/llvm-project/pull/106552