Fix embedded new-space pointer in LCmpObjectEqAndBranch.

R=mvstanton@chromium.org
BUG=chromium:240032
TEST=mjsunit/regress/regress-crbug-240032

Review URL: https://codereview.chromium.org/15779004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14777 ce2b1a6d-e550-0410-aec6-3dcde31c8c00