Make the materialization of smi constants consistent between the two compilers.

Make the materialization of smi constants consistent between the two compilers.

This change makes the full code generator always materialize smi constants to match the behavior
 of the environment tracked in the optimizing compiler. The mismatch between environment
and what the non-optimized code causes problems and potentially crashes when doing deoptimization
and OSR.

BUG=67732

Review URL: http://codereview.chromium.org/6592064

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6982 ce2b1a6d-e550-0410-aec6-3dcde31c8c00