Don't import error_code into the lld namespace.

llvm-svn: 210785
diff --git a/lld/lib/Driver/Driver.cpp b/lld/lib/Driver/Driver.cpp
index 8a03353..e8567ed 100644
--- a/lld/lib/Driver/Driver.cpp
+++ b/lld/lib/Driver/Driver.cpp
@@ -63,7 +63,7 @@
       std::string buf;
       llvm::raw_string_ostream stream(buf);
 
-      if (error_code ec = ie->parse(context, stream)) {
+      if (std::error_code ec = ie->parse(context, stream)) {
         if (FileNode *fileNode = dyn_cast<FileNode>(ie.get()))
           stream << fileNode->errStr(ec) << "\n";
         else if (dyn_cast<Group>(ie.get()))
@@ -130,7 +130,7 @@
 
   // Give linked atoms to Writer to generate output file.
   ScopedTask writeTask(getDefaultDomain(), "Write");
-  if (error_code ec = context.writeFile(*merged)) {
+  if (std::error_code ec = context.writeFile(*merged)) {
     diagnostics << "Failed to write file '" << context.outputPath()
                 << "': " << ec.message() << "\n";
     return false;