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aarch64: mc16: Optimize the BTI landing pads in put/prep_neon

Martin Storsjö requested to merge mstorsjo/dav1d:aarch64-mc16-bti into master

Don't include the BTI landing pad instruction in the loops.

If built with BTI enabled, AARCH64_VALID_JUMP_TARGET expands to a no-op instruction that indicates that indirect jumps can land there. But there's no need for the loops to include that instruction.

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