Handlify map allocation in Genesis::InstallInternalArray.

R=dcarney@chromium.org
TEST=mozilla/js1_5/Regress/regress-367561-01

Review URL: https://codereview.chromium.org/15690018

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14887 ce2b1a6d-e550-0410-aec6-3dcde31c8c00