[clang] [Wunsafe-buffer-usage] Turn off unsafe-buffer warning for methods annotated with clang::unsafe_buffer_usage attribute (PR #125671)

[Mariya Podchishchaeva via cfe-commits]

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@@ -2610,6 +2610,9 @@ void clang::sema::AnalysisBasedWarnings::IssueWarnings(
 
   // The Callback function that performs analyses:
   auto CallAnalyzers = [&](const Decl *Node) -> void {
+    if (isa<FunctionDecl>(Node) && Node->hasAttr<UnsafeBufferUsageAttr>())
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Fznamznon wrote:

The attribute can be applied to a `FunctionDecl` or a `FieldDecl`.
Is the check `isa<FunctionDecl>(Node)` necessary? It seems the `CallableVisitor` won't do anything for `FieldDecl`s anyway.

https://github.com/llvm/llvm-project/pull/125671