[clang] [clang:ast] Suppress warning for unused var without assertions. (NFC) (PR #169822)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Ingo Müller (ingomueller-net)

<details>
<summary>Changes</summary>

This PR suppresses a compiler warning, which turns into an error with `-Werror`, for a variable introduced in #<!-- -->169276 and only used in an assertion (which is, thus, unused if compiled without assertions).

---
Full diff: https://github.com/llvm/llvm-project/pull/169822.diff


1 Files Affected:

- (modified) clang/lib/AST/ExprConstant.cpp (+1) 


``````````diff
diff --git a/clang/lib/AST/ExprConstant.cpp b/clang/lib/AST/ExprConstant.cpp
index 7b9380de6834d..431b58f4627bb 100644
--- a/clang/lib/AST/ExprConstant.cpp
+++ b/clang/lib/AST/ExprConstant.cpp
@@ -12181,6 +12181,7 @@ static bool evalShiftWithCount(
   QualType SourceTy = Call->getArg(0)->getType();
   QualType CountTy = Call->getArg(1)->getType();
   assert(SourceTy->isVectorType() && CountTy->isVectorType());
+  (void)CountTy;
 
   QualType DestEltTy = SourceTy->castAs<VectorType>()->getElementType();
   unsigned DestEltWidth = Source.getVectorElt(0).getInt().getBitWidth();

``````````

</details>


https://github.com/llvm/llvm-project/pull/169822