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AArch64: Move constants of DotProd subpel filters to .rodata

Arpad Panyik requested to merge arpadpanyik-arm/dav1d:mc_dotprod_const into master

The constants used for the subpel filters were placed in the .text section for simplicity and peak performance, but this does not work on systems with execute only .text sections (e.g.: OpenBSD).

The performance cost of moving the constants to the .rodata section is small and mostly within the measurable noise.

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VideoLAN code repository instance