Rob Suderman d86ef4364f [mlir][tosa] Update tosa.rescale for i48 input type
i48 integers require slightly tweaked behavior, specifically supporting zero
point offsetting with slightly higher bitdepth. Updated results lowering
appropriately.

Reviewed By: NatashaKnk

Differential Revision: https://reviews.llvm.org/D102659
2021-06-04 16:36:48 -07:00
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