[opus] [PATCH] Refactor silk_LPC_analysis_filter() & Optimize celt_fir_permit_overflow() for ARM NEON

[Linfeng Zhang]

Hi,

Attached are two patches. Patch 1 refactors silk_LPC_analysis_filter(). And
Patch 2 optimizes the new function celt_fir_permit_overflow() for ARM NEON.

Please recommend a better function name.

We did the same internal code review and testing already.

Thanks,
Linfeng
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