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

llvm-svn: 202639
diff --git a/clang/lib/CodeGen/CodeGenFunction.cpp b/clang/lib/CodeGen/CodeGenFunction.cpp
index ec04fa2..c550aad 100644
--- a/clang/lib/CodeGen/CodeGenFunction.cpp
+++ b/clang/lib/CodeGen/CodeGenFunction.cpp
@@ -1186,7 +1186,7 @@
                                           getContext().getAsArrayType(Ty))) {
       QualType eltType;
       llvm::Value *numElts;
-      llvm::tie(numElts, eltType) = getVLASize(vlaType);
+      std::tie(numElts, eltType) = getVLASize(vlaType);
 
       SizeVal = numElts;
       CharUnits eltSize = getContext().getTypeSizeInChars(eltType);