use interleaveComma

Author: usx95

clang/lib/AST/TypePrinter.cpp

@@ -1912,14 +1912,9 @@ void TypePrinter::printAttributedAfter(const AttributedType *T,
   }
   if (T->getAttrKind() == attr::LifetimeCaptureBy) {
     OS << " [[clang::lifetime_capture_by(";
-    if (auto *attr = dyn_cast_or_null<LifetimeCaptureByAttr>(T->getAttr())) {
-      auto Idents = attr->getArgIdents();
-      for (unsigned I = 0; I < Idents.size(); ++I) {
-        OS << Idents[I]->getName();
-        if (I != Idents.size() - 1)
-          OS << ", ";
-      }
-    }
+    if (auto *attr = dyn_cast_or_null<LifetimeCaptureByAttr>(T->getAttr()))
+      llvm::interleaveComma(attr->getArgIdents(), OS,
+                            [&](auto it) { OS << it->getName(); });
     OS << ")]]";
     return;
   }