[committed, amdgcn] Use V64SI for all remaining add-with-carry insns

[Andrew Stubbs]

This patch does nothing but replace a mode iterator with the concrete 
mode. It has no effect on the generated machine description whatsoever.

This is part of an incremental clean-up of the mode iterators, following 
the introduction of vector QI/HI support. The add-with-carry 
instructions are not interesting for those modes (being mostly used to 
implement DImode splitters), so we can dispense with the notional iterator.

Andrew
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