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[committed] fix ia64 -O0 -fschedule-insns2 ICE

This fixes the problem reported by Andrey Belevatsev on the gcc mailing
list.

Trying to bootstrap with BOOT_CFLAGS set to "-g -O0 -fschedule-insns2"
results in an ICE in the scheduler.  We should not be trying to schedule
at -O0.  The problem is a trivial bug in the ia64.c file which tries to
run a scheduler pass in ia64_reorg, but fails to check for optimize
first.

This was tested with a C only ia64-linux BOOT_CFLAGS="-g -O0
-fschedule-insns2" build.  I get an ICE without the patch.  The build
succeeds with the patch, and there are no meaningful regressions.  A few
of the larger testcases got timeouts because a -O0 built compiler is so
slow, which is not unexpected.
-- 
Jim Wilson, GNU Tools Support, http://www.specifix.com

Attachment: patch.optimize.sched2
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