[C++11] Replace llvm::tie with std::tie.

llvm-svn: 202639
diff --git a/clang/lib/Lex/PPMacroExpansion.cpp b/clang/lib/Lex/PPMacroExpansion.cpp
index 84f1ea5..55b3bd5 100644
--- a/clang/lib/Lex/PPMacroExpansion.cpp
+++ b/clang/lib/Lex/PPMacroExpansion.cpp
@@ -796,7 +796,7 @@
     for (unsigned i = 0, e = MacroExpandingLexersStack.size(); i != e; ++i) {
       TokenLexer *prevLexer;
       size_t tokIndex;
-      llvm::tie(prevLexer, tokIndex) = MacroExpandingLexersStack[i];
+      std::tie(prevLexer, tokIndex) = MacroExpandingLexersStack[i];
       prevLexer->Tokens = MacroExpandedTokens.data() + tokIndex;
     }
   }