Incorporate feedback from issue 679 and issue 690 into the

Incorporate feedback from issue 679 and issue 690 into the
benchmark suite thus forming a new candidate benchmark revision:

  * Remove dead code from RayTrace benchmark.
  * Avoid repeated number-to-string conversion in Splay.

Review URL: http://codereview.chromium.org/2086005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4658 ce2b1a6d-e550-0410-aec6-3dcde31c8c00