Consider out-of-bounds accesses as escaping uses.

R=titzer@chromium.org
TEST=mjsunit/compiler/escape-analysis

Review URL: https://codereview.chromium.org/23892007

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16589 ce2b1a6d-e550-0410-aec6-3dcde31c8c00