Logging-related changes.

Logging-related changes.

 - when logging 'open-tag' / 'close-tag' events, don't depend on
   FLAG_log (as it may be not enabled, e.g. in Chromium);

 - PauseProfiler / ResumeProfiler were supposing that they
   use 'is_logging_' var exclusively, thus preventing any
   other logging that may be turned on for diagnostic purposes.

Committed: http://code.google.com/p/v8/source/detail?r=3986

[Søren Thygesen Gjesse, 2010-03-01 10:15:12]

LGTM