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[BP] AArch64: Fix potential out of bounds access in DotProd H/HV filters

Jean-Baptiste Kempf requested to merge cherry-pick-92f592ed into 1.4.x

The DotProd/I8MM horizontal and HV/2D subpel filters use -4 offset for sampling instead of -3 to be better aligned in some cases. This resulted in an out of bounds access, which led to crashes.

This patch fixes it.

(cherry picked from commit 92f592ed)

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