[clang] [APINotes] Diagnose invalid Where.Parameters selectors (PR #209408)

[Gábor Horváth via cfe-commits]

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@@ -788,6 +789,47 @@ bool clang::api_notes::parseAndDumpAPINotes(StringRef YI,
 namespace {
 using namespace api_notes;
 
+struct KnownFunctionSelector {
+  llvm::StringRef Name;
+  llvm::ArrayRef<llvm::StringRef> Parameters;
+};
+
+static bool equalParameterSelectors(llvm::ArrayRef<llvm::StringRef> LHS,
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Xazax-hun wrote:

I think we should have `operator==` defined for `llvm::ArrayRef` so maybe this one is redundant?

https://github.com/llvm/llvm-project/pull/209408