[x265] [PATCH] asm: code for addAvg luma and chroma all sizes

[chen]

The code seems right, but there have some problem:
1. we can double stride in front of function, so we can reduce "r3*2" to "r3"
2. OFFSET is a constant and share y many function, so we may move it to const-a.asm and rename to pw_16448
3. please analyze dynamic range for function, I am not sure it will be overflow or not after add constant 16448

 
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