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/ExecutionEngine/MCJIT/SectionMemoryManager.cpp

@@ -155,7 +155,7 @@ error_code SectionMemoryManager::applyMemoryGroupPermissions(MemoryGroup &MemGro
       }
   }
 
-  return error_code::success();
+  return error_code();
 }
 
 void SectionMemoryManager::invalidateInstructionCache() {