[clang] [Clang] add emit -Wignored-cv-qualifiers diagnostic for cv-qualified base classes (PR #132116)

[Erich Keane via cfe-commits]

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@@ -497,6 +497,7 @@ def GNUImaginaryConstant : DiagGroup<"gnu-imaginary-constant">;
 def IgnoredGCH : DiagGroup<"ignored-gch">;
 def IgnoredReferenceQualifiers : DiagGroup<"ignored-reference-qualifiers">;
 def IgnoredQualifiers : DiagGroup<"ignored-qualifiers", [IgnoredReferenceQualifiers]>;
+def IgnoredCVQualifiers : DiagGroup<"ignored-cv-qualifiers", [IgnoredReferenceQualifiers]>;
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erichkeane wrote:

I'd probably choose a better name for this group.  I think it should be clear that this is for base classes, it isn't cv qualifiers, it is base classes.

So something like `ignored-base-class-qualifiers`.

https://github.com/llvm/llvm-project/pull/132116