Follow-up change to PR30186

`std::string(...)` -> `.str()`

Author: bulbazord

lib/AST/ReferencedNameTracker.cpp

@@ -136,7 +136,7 @@ void ReferencedNameTracker::enumerateMemberUses(
       std::string context =
           DependencyKey::computeContextForProvidedEntity<NodeKind::member>(
               nominal);
-      std::string name = std::string(rawName.userFacingName());
+      std::string name = rawName.userFacingName().str();
       enumerateUsedDecl(NodeKind::member, context, name, isCascadingUse);
     }
   }

lib/Frontend/PrintingDiagnosticConsumer.cpp

@@ -455,7 +455,7 @@ namespace {
 
     void addMessage(SourceManager &SM, SourceLoc Loc, DiagnosticKind Kind,
                     StringRef Message) {
-      Messages.push_back({lineByteOffsetForLoc(SM, Loc), Kind, std::string(Message)});
+      Messages.push_back({lineByteOffsetForLoc(SM, Loc), Kind, Message.str()});
     }
 
     void addHighlight(SourceManager &SM, CharSourceRange Range) {
@@ -465,7 +465,7 @@ namespace {
 
     void addFixIt(SourceManager &SM, CharSourceRange Range, StringRef Text) {
       FixIts.push_back({lineByteOffsetForLoc(SM, Range.getStart()),
-                        lineByteOffsetForLoc(SM, Range.getEnd()), std::string(Text)});
+                        lineByteOffsetForLoc(SM, Range.getEnd()), Text.str()});
     }
 
     void render(unsigned LineNumberIndent, raw_ostream &Out) {