[clang] [Clang][CWG1815] Support lifetime extension of temporary created by aggregate initialization using a default member initializer (PR #87933)

[via cfe-commits]

yronglin wrote:

I've debug in local. The crash issue caused by initializer rebuild failed in https://github.com/llvm/llvm-project/blob/8e00703be9ceb41d9b80c2bc8f024a9610b9aaa1/clang/lib/Sema/SemaExpr.cpp#L5717-L5721 , if remove Line 5717 `SFINAETrap Trap(*this);`, we can got diagnostics like the following:
```

```

https://github.com/llvm/llvm-project/pull/87933