Stage 3 rules now in force on mainline

[Arnaud Charlet]

> We will leave that to the discretion of the Ada maintainers.  Ada is a 
> higly special case; we don't much worry about it for releases, so it's 
> really up to the Ada maintainers to decide what they want to do.

Certainly fine with me. Thanks for the quick feedback.

For now, I will continue merging changes as usual (which are typically
very safe anyway).

Well, as usual meaning when Ada isn't broken by middle-end changes.

Arno