[clang] SignAnalysisTest.cpp: Suppress a warning. [-Wunused-template] (PR #215563)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: NAKAMURA Takumi (chapuni)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/215563.diff


1 Files Affected:

- (modified) clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp (+1) 


``````````diff
diff --git a/clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp b/clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp
index b8fc528dbdce0..08c1bdc4f58ed 100644
--- a/clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp
+++ b/clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp
@@ -444,6 +444,7 @@ void runDataflow(llvm::StringRef Code, Matcher Match,
 
 // FIXME add this to testing support.
 template <typename NodeType, typename MatcherType>
+[[maybe_unused]]
 const NodeType *findFirst(ASTContext &ASTCtx, const MatcherType &M) {
   auto TargetNodes = match(M.bind("v"), ASTCtx);
   assert(TargetNodes.size() == 1 && "Match must be unique");

``````````

</details>


https://github.com/llvm/llvm-project/pull/215563