[clang] [clang] Allow class with anonymous union member to be const-default-constructible even if a union member has a default member initializer (#95854) (PR #96301)

[Shafik Yaghmour via cfe-commits]

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+// RUN: %clang_cc1 -std=c++23 -fsyntax-only -verify %s
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shafik wrote:

I think this may be a more appropriate place for the test:

https://github.com/llvm/llvm-project/blob/main/clang/test/SemaCXX/anonymous-union.cpp

We usually wrap tests from github issues in a namespace starting with `GH` and followed by the issue number for this case `namespace GH95854`

https://github.com/llvm/llvm-project/pull/96301