Attempt to fix lld-x86_64-win7 bot.
Attempt to fix lld-x86_64-win7 bot.

The test is failing on the bot because "/subsystem:console" was
truncated for some reason. I don't know why that is happening on
that machine (it is not reproducible on my Windows machine).
In this patch, I'm trying to tame it by making the output shorter.

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@294502 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld