Replace llvm::error_code with std::error_code.

llvm-svn: 210780
diff --git a/clang/lib/Tooling/Tooling.cpp b/clang/lib/Tooling/Tooling.cpp
index f824741..5d3de8a 100644
--- a/clang/lib/Tooling/Tooling.cpp
+++ b/clang/lib/Tooling/Tooling.cpp
@@ -145,7 +145,7 @@
   }
 
   SmallString<1024> AbsolutePath = RelativePath;
-  llvm::error_code EC = llvm::sys::fs::make_absolute(AbsolutePath);
+  std::error_code EC = llvm::sys::fs::make_absolute(AbsolutePath);
   assert(!EC);
   (void)EC;
   llvm::sys::path::native(AbsolutePath);