Add missing includes. make_unique proliferated everywhere.

llvm-svn: 230909
diff --git a/llvm/tools/lto/lto.cpp b/llvm/tools/lto/lto.cpp
index 714b8e0..ecafb03 100644
--- a/llvm/tools/lto/lto.cpp
+++ b/llvm/tools/lto/lto.cpp
@@ -13,6 +13,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm-c/lto.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/CodeGen/CommandFlags.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/LTO/LTOCodeGenerator.h"