Index: lld/wasm/OutputSections.h
===================================================================
--- lld/wasm/OutputSections.h
+++ lld/wasm/OutputSections.h
@@ -35,7 +35,7 @@
       : Type(Type), Name(Name) {}
   virtual ~OutputSection() = default;
 
-  std::string getSectionName() const;
+  StringRef getSectionName() const;
   void setOffset(size_t NewOffset) {
     log("setOffset: " + toString(*this) + ": " + Twine(NewOffset));
     Offset = NewOffset;
Index: lld/wasm/OutputSections.cpp
===================================================================
--- lld/wasm/OutputSections.cpp
+++ lld/wasm/OutputSections.cpp
@@ -58,17 +58,17 @@
 // Returns a string, e.g. "FUNCTION(.text)".
 std::string lld::toString(const OutputSection &Sec) {
   if (!Sec.Name.empty())
-    return Sec.getSectionName() + "(" + Sec.Name + ")";
+    return (Sec.getSectionName() + "(" + Sec.Name + ")").str();
   return Sec.getSectionName();
 }
 
-std::string OutputSection::getSectionName() const {
+StringRef OutputSection::getSectionName() const {
   return sectionTypeToString(Type);
 }
 
 void OutputSection::createHeader(size_t BodySize) {
   raw_string_ostream OS(Header);
-  debugWrite(OS.tell(), "section type [" + Twine(getSectionName()) + "]");
+  debugWrite(OS.tell(), "section type [" + getSectionName() + "]");
   encodeULEB128(Type, OS);
   writeUleb128(OS, BodySize, "section size");
   OS.flush();