RFA: patch for more accurate scheduling the schedule groups.

[Neil Booth]

Vladimir Makarov wrote:-

>   The following patch permits more accurate insn scheduling taking all
> insns in schedule groups into account.  Scheduler will issue each insn
> in a schedule group separately.  To guarantee that the schedule group
> is issued as whole, the new anti-dependencies between adjacent insns
> in schedule group are added and insns which are a tail of the schedule
> group always will be first in the queue.

Wow, that removed a lot of code!

Neil.