[clang] Reapply "[Clang][CWG1815] Support lifetime extension of temporary created by aggregate initialization using a default member initializer" (PR #97308)

[via cfe-commits]

yronglin wrote:

I've found the root cause. It's because Exprs in `MaybeODRUseExprs` was losed after enter `RebuildDefaultInit` in `InitListChecker::FillInEmptyInitForField`.

https://github.com/llvm/llvm-project/pull/97308