[clang] Correctly diagnose incomplete arrays with static storage in C (PR #134374)

[Mariya Podchishchaeva via cfe-commits]

================
@@ -319,6 +319,9 @@ Improvements to Clang's diagnostics
 - ``-Wc++98-compat`` no longer diagnoses use of ``__auto_type`` or
   ``decltype(auto)`` as though it was the extension for ``auto``. (#GH47900)
 
+- Now correctly diagnose use of a tentative definition of an array with static
----------------
Fznamznon wrote:

Looking at the tests I don't think they have to be used to trigger the warning
```suggestion
- Now correctly diagnose a tentative definition of an array with static
```

https://github.com/llvm/llvm-project/pull/134374