[patch] In Graphite, don't compute the new IV type based on the old_iv type

[Sebastian Pop]

Hi,

The attached patch is one step forward in eliminating the need
to canonicalize the IVs in loops handled by graphite.  The patch
eliminates one use of the loop->single_iv in the computation of
the type of the new induction variable.

I committed this patch to the graphite branch for a full test.
I will commit this to trunk once that passes.

Sebastian Pop
--
AMD / Open Source Compiler Engineering / GNU Tools
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