[x265] [arm64] port scale1D_128to64 and scale2D_64to32

Pop, Sebastian spop at amazon.com
Fri Jul 30 18:27:36 UTC 2021


A small change to save a few bytes in code size.
I replaced the 4 LD1 2 regs with 2 LD1 4 regs.
No performance change.

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