[PATCH]: Fix scheduler priorities update

[Maxim Kuvyrkov]

Hi!

While testing my other patch I came across a bug in IA64 speculation 
support in scheduler.  The problem is in priorities update mechanism 
that is used to calculate proper priorities after speculative movement 
of an instruction.  The speculative movement discards some of the insn's 
dependencies which in turn might affect the priorities of insn's former 
producers.  The bug is that not all producers get their priorities updated.

The attached patch fixes this problem and was bootstrapped and now being 
regtested on {x86_64, ia64}-linux-gnu.

:ADDPATCH scheduler:

Thanks,

Maxim
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