Addition supports lhs immediates by commuting. Subtraction supports only zero
lhs immediates, through use of the zero register.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/518893002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23565 ce2b1a6d-e550-0410-aec6-3dcde31c8c00