[clang] [libcxx] "Reapply "[Sema] Fix crash on invalid code with parenthesized aggrega… (PR #76833)

[Mark de Wever via cfe-commits]

mordante wrote:

@ilya-biryukov this is the new attempt to land this patch, the version you committed breaks the libc++ CI. I'll try to fix it this week.


https://github.com/llvm/llvm-project/pull/76833