print user provide value in tabstop diagnostic

[csmoe]

Summary

github issue: https://github.com/llvm/llvm-project/issues/62912

[jansvoboda11]

LGTM, thanks!

I see this is your first contribution. I'm happy to commit this patch for you if you don't have commit access yet. Just let me know the name and email you'd like me to put in the commit author field.

[csmoe]

thanks for your review :)
user: csmoe
email: [e-mail]

clang/lib/Frontend/CompilerInvocation.cpp

     DiagMask = DiagnosticLevelMask::All;
   Opts.setVerifyIgnoreUnexpected(DiagMask);
   if (Opts.TabStop == 0 || Opts.TabStop > DiagnosticOptions::MaxTabStop) {
-    Opts.TabStop = DiagnosticOptions::DefaultTabStop;
     Diags->Report(diag::warn_ignoring_ftabstop_value)
         << Opts.TabStop << DiagnosticOptions::DefaultTabStop;
+    Opts.TabStop = DiagnosticOptions::DefaultTabStop;
   }
 
   addDiagnosticArgs(Args, OPT_W_Group, OPT_W_value_Group, Opts.Warnings);