Minor clarifications and simplifications as well as additional checks.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/409743004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22568 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Revert "Minor clarifications and simplifications as well as additional checks."

This reverts commit d32eacbdea3fc0c119da06abe95b07a83c67aa48.

TBR=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/410083005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22569 ce2b1a6d-e550-0410-aec6-3dcde31c8c00