Doing a function call into the logger to decide whether logging is
enabled or not is more costly than necessary.

This CL changes logging to take FLAG_log as main signal whether logging
could be active. If FLAG_log == false, logging cannot be active. In
that case we always call into the logger and perform detailed checks
there.

This CL changes flag-definitions to set FLAG_log if they need logging.

Change-Id: Ia51ed9fb7128451bf1dcf345fab257547aab4a47
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2602461Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72186}