[clang] [clang][test] Add .cuh as a recognized extension for lit test files (PR #124080)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Nathan Ridge (HighCommander4)

<details>
<summary>Changes</summary>

Fixes https://github.com/llvm/llvm-project/issues/124079

---
Full diff: https://github.com/llvm/llvm-project/pull/124080.diff


1 Files Affected:

- (modified) clang/test/lit.cfg.py (+1) 


``````````diff
diff --git a/clang/test/lit.cfg.py b/clang/test/lit.cfg.py
index 7e7934d5fe0f5f..e4b39c4f715971 100644
--- a/clang/test/lit.cfg.py
+++ b/clang/test/lit.cfg.py
@@ -33,6 +33,7 @@
     ".m",
     ".mm",
     ".cu",
+    ".cuh",
     ".hip",
     ".hlsl",
     ".ll",

``````````

</details>


https://github.com/llvm/llvm-project/pull/124080