'make ia32' should not build ia32.optdebug.
'make ia32.clean' should delete ia32.optdebug output.
'make quickcheck' should be terminatable by hitting Ctrl+C just once.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/106443002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18259 ce2b1a6d-e550-0410-aec6-3dcde31c8c00