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ARM64: Various optimizations for symbol decode

Kyle Siefring requested to merge KyleSiefring/dav1d:arm64_msac_impr4_review into master

Changes stem from redesigning the reduction stage of the multisymbol decode function.

  • No longer use adapt4 for 5 possible symbol values
  • Specialize reduction for 4/8/16 decode functions
  • Modify control flow

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