[clang] [clang] Disallow VLA type compound literals (PR #91891)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman commented:

Oops, we used to diagnose this until Clang 17 (I think I accidentally regressed this behavior when implementing empty inits for C23). Thank you for the fix!

Please be sure to add a release note to clang/docs/ReleaseNotes.rst so users know about the fix.

https://github.com/llvm/llvm-project/pull/91891