Use StringRef instead of std::string in DIEString.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89793 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index 8eae7b2..993cdbf 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -728,7 +728,7 @@
 /// EmitString - Emit a string with quotes and a null terminator.
 /// Special characters are emitted properly.
 /// \literal (Eg. '\t') \endliteral
-void AsmPrinter::EmitString(const std::string &String) const {
+void AsmPrinter::EmitString(const StringRef String) const {
   EmitString(String.data(), String.size());
 }