[clang] [clang-tools-extra] [clang] Extend diagnose_if to accept more detailed warning information (PR #70976)

[Aaron Ballman via cfe-commits]

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@@ -509,30 +499,32 @@ DiagnosticIDs::getDiagnosticLevel(unsigned DiagID, SourceLocation Loc,
 diag::Severity
 DiagnosticIDs::getDiagnosticSeverity(unsigned DiagID, SourceLocation Loc,
                                      const DiagnosticsEngine &Diag) const {
-  assert(getBuiltinDiagClass(DiagID) != CLASS_NOTE);
+  const bool IsCustomDiag = DiagnosticIDs::IsCustomDiag(DiagID);
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AaronBallman wrote:

We don't typically use top-level const on locals (here and elsewhere in the patch).

https://github.com/llvm/llvm-project/pull/70976