stream. Enhance the debug code to save and restore the unused holder_reg
  at these points.
- Fix lint issues.

Review URL: http://codereview.chromium.org/8039

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@545 ce2b1a6d-e550-0410-aec6-3dcde31c8c00