Use error_code() instead of error_code::succes()

There is no std::error_code::success, so this removes much of the noise
in transitioning to std::error_code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209952 91177308-0d34-0410-b5e6-96231b3b80d8

lib/IR/Module.cpp

@@ -396,7 +396,7 @@ void Module::Dematerialize(GlobalValue *GV) {
 
 error_code Module::materializeAll() {
   if (!Materializer)
-    return error_code::success();
+    return error_code();
   return Materializer->MaterializeModule(this);
 }
 
@@ -405,7 +405,7 @@ error_code Module::materializeAllPermanently() {
     return EC;
 
   Materializer.reset();
-  return error_code::success();
+  return error_code();
 }
 
 //===----------------------------------------------------------------------===//