Added check for logging enabled in two places where processing/allocation was performed only to be used only as parameters for the LOG macro. Looked through all the uses of the LOG macro and found only these two places where additional checking was required.

Fixed a couple of comments looking through all the uses of the LOG macro.
Review URL: http://codereview.chromium.org/20018

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1220 ce2b1a6d-e550-0410-aec6-3dcde31c8c00