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arm: itx: Do clipping in all narrowing downshifts

Martin Storsjö requested to merge mstorsjo/dav1d:arm-itx-narrow-clip into master

This should avoid the risk of unexpected wraparound. This shouldn't technically be needed for spec compliant bitstreams. In practice, this fixes the mismatch observed in issue #388 (closed) (in checkasm generated input data).

Closes #388 (closed).

Edited by Henrik Gramner

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