Dead code elimination of inlined arguments objects causes wrong deopt info to be generated - instead of materializing the arguments, we get 'undefined'.

Golem says the change is perf-neutral.

R=mstarzinger@chromium.org
BUG=

Review URL: https://codereview.chromium.org/208683006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20529 ce2b1a6d-e550-0410-aec6-3dcde31c8c00