Fix the sanitizer-windows bot.
Fix the sanitizer-windows bot.

Looks like r303801 broke the sanitizer-windows bot. I don't fully
understand what is going on, so I'll partially revert that patch.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@303805 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld