[clang] [-Wunsafe-buffer-usage] Ignore consteval functions (PR #171503)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/lib/Analysis/UnsafeBufferUsage.cpp clang/test/SemaCXX/warn-unsafe-buffer-usage.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Analysis/UnsafeBufferUsage.cpp b/clang/lib/Analysis/UnsafeBufferUsage.cpp
index 23798becf..99c7a4417 100644
--- a/clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ b/clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -4460,7 +4460,8 @@ void clang::checkUnsafeBufferUsage(const Decl *D,
   if (const auto *FD = dyn_cast<FunctionDecl>(D)) {
     // Consteval functions are free of UB by the spec, so we don't need to
     // visit them or produce diagnostics.
-    if (FD->isConsteval()) return;
+    if (FD->isConsteval())
+      return;
     // We do not want to visit a Lambda expression defined inside a method
     // independently. Instead, it should be visited along with the outer method.
     // FIXME: do we want to do the same thing for `BlockDecl`s?

``````````

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https://github.com/llvm/llvm-project/pull/171503