Don't import make_error_code into the llvm namespace.

llvm-svn: 210772
diff --git a/llvm/lib/Support/MemoryBuffer.cpp b/llvm/lib/Support/MemoryBuffer.cpp
index b1ebbf8..ab554cb 100644
--- a/llvm/lib/Support/MemoryBuffer.cpp
+++ b/llvm/lib/Support/MemoryBuffer.cpp
@@ -361,7 +361,7 @@
   if (!Buf) {
     // Failed to create a buffer. The only way it can fail is if
     // new(std::nothrow) returns 0.
-    return make_error_code(std::errc::not_enough_memory);
+    return std::make_error_code(std::errc::not_enough_memory);
   }
 
   std::unique_ptr<MemoryBuffer> SB(Buf);