Replace a few std::string& with StringRef. NFC.
Patch by Косов Евгений!
llvm-svn: 238774
diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index 3f89ea6..4007914 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -199,7 +199,7 @@
/// Stringify - Convert the specified string into a C string, with surrounding
/// ""'s, and with escaped \ and " characters.
-std::string Lexer::Stringify(const std::string &Str, bool Charify) {
+std::string Lexer::Stringify(StringRef Str, bool Charify) {
std::string Result = Str;
char Quote = Charify ? '\'' : '"';
for (unsigned i = 0, e = Result.size(); i != e; ++i) {