[clang] [clang] Revert default behavior change of P0522R0 implementation (PR #91811)

[Erich Keane via cfe-commits]

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@@ -7249,15 +7249,15 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
   Args.addOptOutFlag(CmdArgs, options::OPT_fassume_unique_vtables,
                      options::OPT_fno_assume_unique_vtables);
 
-  // -frelaxed-template-template-args is deprecated.
-  if (Arg *A =
-          Args.getLastArg(options::OPT_frelaxed_template_template_args,
-                          options::OPT_fno_relaxed_template_template_args)) {
+  // -fno-relaxed-template-template-args is deprecated.
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erichkeane wrote:

I'm not sure I get the case for marking this deprecated?  

https://github.com/llvm/llvm-project/pull/91811