Use CommonNodeCache for heap constants in ChangeLowering.

TEST=compiler-unittests
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/466673004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23077 ce2b1a6d-e550-0410-aec6-3dcde31c8c00