[mlir][acc] Use index for acc.par_width results (#187734) When acc.par_width was introduced in https://github.com/llvm/llvm-project/pull/184864 there was a discussion on whether to use index or create a new type for the output of the operation. It was decided to create a new type; but this means that launch arguments cannot be used directly in the region such as for loop bounds without a conversion from the new type to index. In order to avoid the casting operations (and introduction of an actual operation to do this cast), simply restore acc.par_width to generate index type. This allows its result to be directly used in acc.compute_region.
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