Minor cleanups, hopefully fixing an issue with VC's /Ze option on the way.

BUG=2859
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/23553002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix --trace-hydrogen --enable-slow-asserts combination.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/23295035

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16350 ce2b1a6d-e550-0410-aec6-3dcde31c8c00