Scheduler cleanups, 4/N

[Bernd Schmidt]

We have a mechanism to prevent the scheduler from touching certain
blocks; this is used by modulo scheduling. sched-ebb does not honor this
flag currently; this patch fixes it. Bootstrapped and tested on
i686-linux (pointlessly... but it's also used in our local tree for a
new target, TI C6X).


Bernd
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