Tests for ChangeLowering are target tests since they use the Linkage.

This fixes MIPS.

TBR=titzer@chromium.org

Review URL: https://codereview.chromium.org/463803003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23071 ce2b1a6d-e550-0410-aec6-3dcde31c8c00