diff --git a/lldb/include/lldb/Expression/REPL.h b/lldb/include/lldb/Expression/REPL.h
--- a/lldb/include/lldb/Expression/REPL.h
+++ b/lldb/include/lldb/Expression/REPL.h
@@ -131,7 +131,7 @@
 
   virtual Status DoInitialization() = 0;
 
-  virtual ConstString GetSourceFileBasename() = 0;
+  virtual llvm::StringRef GetSourceFileBasename() = 0;
 
   virtual const char *GetAutoIndentCharacters() = 0;
 
diff --git a/lldb/source/Expression/REPL.cpp b/lldb/source/Expression/REPL.cpp
--- a/lldb/source/Expression/REPL.cpp
+++ b/lldb/source/Expression/REPL.cpp
@@ -57,14 +57,14 @@
 }
 
 std::string REPL::GetSourcePath() {
-  ConstString file_basename = GetSourceFileBasename();
+  llvm::StringRef file_basename = GetSourceFileBasename();
   FileSpec tmpdir_file_spec = HostInfo::GetProcessTempDir();
   if (tmpdir_file_spec) {
     tmpdir_file_spec.SetFilename(file_basename);
     m_repl_source_path = tmpdir_file_spec.GetPath();
   } else {
     tmpdir_file_spec = FileSpec("/tmp");
-    tmpdir_file_spec.AppendPathComponent(file_basename.GetStringRef());
+    tmpdir_file_spec.AppendPathComponent(file_basename);
   }
 
   return tmpdir_file_spec.GetPath();
diff --git a/lldb/source/Plugins/REPL/Clang/ClangREPL.h b/lldb/source/Plugins/REPL/Clang/ClangREPL.h
--- a/lldb/source/Plugins/REPL/Clang/ClangREPL.h
+++ b/lldb/source/Plugins/REPL/Clang/ClangREPL.h
@@ -36,7 +36,7 @@
 protected:
   Status DoInitialization() override;
 
-  ConstString GetSourceFileBasename() override;
+  llvm::StringRef GetSourceFileBasename() override;
 
   const char *GetAutoIndentCharacters() override;
 
diff --git a/lldb/source/Plugins/REPL/Clang/ClangREPL.cpp b/lldb/source/Plugins/REPL/Clang/ClangREPL.cpp
--- a/lldb/source/Plugins/REPL/Clang/ClangREPL.cpp
+++ b/lldb/source/Plugins/REPL/Clang/ClangREPL.cpp
@@ -62,8 +62,9 @@
 
 Status ClangREPL::DoInitialization() { return Status(); }
 
-ConstString ClangREPL::GetSourceFileBasename() {
-  return ConstString("repl.c");
+llvm::StringRef ClangREPL::GetSourceFileBasename() {
+  static constexpr llvm::StringLiteral g_repl("repl.c");
+  return g_repl;
 }
 
 const char *ClangREPL::GetAutoIndentCharacters() { return "  "; }