[Patch] OpenACC: Fix integer-type issue with collapse/tile [PR97880]

[Tobias Burnus]

Now committed as r11-5489-gf324479caf0ac326534f4fcf72cb12991ccddb3d

Tobias

On 25.11.20 12:00, Tobias Burnus wrote:
> Here, the problem was that we were mixing types when calculating
> the product of loop-steps, each type was taken from the loop var.
>
> Solution: take the largest type as diff_type and use it everywhere.
>
> And add a missing 'fold_convert' to fix the actual ICE.
>
> Comments? If not, I will commit it later.
>
> Tobias
>
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