The goal is to make possible having --prof flag always enabled in Chromium.  Currently we can't do this because --prof causes compiler and gc to log code creations / moves / deletes which aren't needed until we start profiling.  With LogCompiledFunctions it will be possible not to log anything until we start profiling.  When started, the current map of compiled functions will be logged and compiler / gc logging will be enabled to update current state.  When profling is stopped, logging will be turned off again.

Funny that testing code is actually much longer and complex than function code.

Review URL: http://codereview.chromium.org/112036

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2009 ce2b1a6d-e550-0410-aec6-3dcde31c8c00