[clang-tools-extra] [llvm] [clang] [Clang] Fix : More Detailed "No expected directives found" (PR #78338)

[Timm Baeder via cfe-commits]

================
@@ -1098,7 +1098,16 @@ void VerifyDiagnosticConsumer::CheckDiagnostics() {
     // Produce an error if no expected-* directives could be found in the
     // source file(s) processed.
     if (Status == HasNoDirectives) {
-      Diags.Report(diag::err_verify_no_directives).setForceEmit();
+      std::string directives;
+      for (auto &Prefix : Diags.getDiagnosticOptions().VerifyPrefixes) {
+        directives = directives + Prefix + ",";
+      }
----------------
tbaederr wrote:

In `PrintUnexpected` we're simply using 
`Diags.getDiagnosticOptions().VerifyPrefixed.begin`.  How is this case 
different?

https://github.com/llvm/llvm-project/pull/78338
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