Avoid an unused variable warning when assertions are off
Avoid an unused variable warning when assertions are off

Patch by Mike Edwards. Thanks!

git-svn-id: f6089bf0e6284f307027cef4f64114ee9ebb0424@232015 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lld,llvm-mirror/lld