[clang] Add 'enum_select' diagnostic selection to clang. (PR #122505)

[Erich Keane via cfe-commits]

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@@ -886,6 +909,11 @@ struct DiagTextDocPrinter : DiagTextVisitor<DiagTextDocPrinter> {
       makeRowSeparator(RST[I]);
   }
 
+  void VisitEnumSelect(EnumSelectPiece *P) {
+    // For now, document this as if it were a 'select'.
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erichkeane wrote:

I don't think so?  Actually, the 'For now,' could probably go away.  The documentation page seems more directed at someone 'reading' the documentation, so the "list of possible things this could say" is likely sufficient.  WDYT?

https://github.com/llvm/llvm-project/pull/122505