[clang] [clang][Sema] Add regression test for invalid friend declaration (PR #224798)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Jeewoong Kim (JeewoongKim)

<details>
<summary>Changes</summary>

Added a regression test for #<!-- -->132614.

The original fuzzer reproducer no longer crashes on `main`.
This adds coverage for the friend function declaration path, which is not covered by
the existing test in `class.friend/p6.cpp`.

Tested `clang/test/CXX/class/class.friend/p6.cpp` locally.

---
Full diff: https://github.com/llvm/llvm-project/pull/224798.diff


1 Files Affected:

- (modified) clang/test/CXX/class/class.friend/p6.cpp (+1) 


``````````diff
diff --git a/clang/test/CXX/class/class.friend/p6.cpp b/clang/test/CXX/class/class.friend/p6.cpp
index a96dd8a3d4e4a..2152c87e38ef6 100644
--- a/clang/test/CXX/class/class.friend/p6.cpp
+++ b/clang/test/CXX/class/class.friend/p6.cpp
@@ -20,4 +20,5 @@ class A {
   friend thread_local class G; // expected-error {{'thread_local' is invalid in friend declarations}}
 #endif
   friend register enum; // expected-error {{expected identifier or '{'}} expected-error {{'register' is invalid in friend declarations}}
+  friend static unknown foo(); // expected-error {{unknown type name 'unknown'}} expected-error {{'static' is invalid in friend declarations}}
 };

``````````

</details>


https://github.com/llvm/llvm-project/pull/224798