More StringRef to std::string conversion changes

This fixes the master-next build.

Author: MForster

include/swift/Reflection/TypeRef.h

@@ -352,7 +352,7 @@ class OpaqueArchetypeTypeRef final : public TypeRef {
                            StringRef description, unsigned ordinal,
                            ArrayRef<ArrayRef<const TypeRef *>> argumentLists) {
     TypeRefID ID;
-    ID.addString(idString);
+    ID.addString(idString.str());
     ID.addInteger(ordinal);
     for (auto argList : argumentLists) {
       ID.addInteger(0u);

stdlib/public/Reflection/TypeRef.cpp

@@ -258,8 +258,8 @@ class PrintTypeRef : public TypeRefVisitor<PrintTypeRef, void> {
 
   void visitOpaqueArchetypeTypeRef(const OpaqueArchetypeTypeRef *O) {
     printHeader("opaque_archetype");
-    printField("id", O->getID());
-    printField("description", O->getDescription());
+    printField("id", O->getID().str());
+    printField("description", O->getDescription().str());
     fprintf(file, " ordinal %u ", O->getOrdinal());
     for (auto argList : O->getArgumentLists()) {
       fprintf(file, "\n");