Make llvm::StringRef to std::string conversions explicit.

This is how it should've been and brings it more in line with
std::string_view. There should be no functional change here.

This is mostly mechanical from a custom clang-tidy check, with a lot of
manual fixups. It uncovers a lot of minor inefficiencies.

This doesn't actually modify StringRef yet, I'll do that in a follow-up.

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/unittests/Lex/LexerTest.cpp b/clang/unittests/Lex/LexerTest.cpp
index ad9010e..c68eed9 100644
--- a/clang/unittests/Lex/LexerTest.cpp
+++ b/clang/unittests/Lex/LexerTest.cpp
@@ -98,7 +98,7 @@ protected:
                              SourceMgr, LangOpts, &Invalid);
     if (Invalid)
       return "<INVALID>";
-    return Str;
+    return std::string(Str);
   }
 
   FileSystemOptions FileMgrOpts;