SuccessChanges

Summary

  1. Fix Windows buildbots (details)
Commit 909d7bf9a7c5eb728f4660541ab33089132409fe by ruiu
Fix Windows buildbots
`stdout` and `stderr` might be defined as macros, so we needed to avoid
using them as variable names.
The file was modifiedlld/include/lld/Common/Driver.h