[clang] [llvm] [AST] Print the separator "," for template arguments in ConceptReference::print (PR #91750)

[Haojian Wu via cfe-commits]

================
@@ -106,9 +106,15 @@ void ConceptReference::print(llvm::raw_ostream &OS,
   ConceptName.printName(OS, Policy);
   if (hasExplicitTemplateArgs()) {
     OS << "<";
+    bool First = true;
     // FIXME: Find corresponding parameter for argument
-    for (auto &ArgLoc : ArgsAsWritten->arguments())
+    for (auto &ArgLoc : ArgsAsWritten->arguments()) {
+      if (First)
+        First = false;
+      else
+        OS << ", ";
----------------
hokein wrote:

Thanks! I wasn't aware we have such a helpful utility.

https://github.com/llvm/llvm-project/pull/91750
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