Commits on May 9, 2022

1. zstd: Faster decoding memcopy in asm …

   Use faster method for `copyMemory` and `copyOverlappedMemory`.
   
   ```
   λ go test -short -bench=seqdec_execute >after.txt&&benchcmp before.txt after.txt
   benchmark                                                                                       old ns/op     new ns/op     delta
   Benchmark_seqdec_execute/n-12286-lits-13914-prev-9869-1990358-3296656-win-4194304.blk-32        129910        130620        +0.55%
   Benchmark_seqdec_execute/n-12485-lits-6960-prev-976039-2250252-2463561-win-4194304.blk-32       139487        134032        -3.91%
   Benchmark_seqdec_execute/n-14746-lits-14461-prev-209-8-1379909-win-4194304.blk-32               37155         38636         +3.99%
   Benchmark_seqdec_execute/n-1525-lits-1498-prev-2009476-797934-2994405-win-4194304.blk-32        16318         15788         -3.25%
   Benchmark_seqdec_execute/n-3478-lits-3628-prev-895243-2104056-2119329-win-4194304.blk-32        44386         43959         -0.96%
   Benchmark_seqdec_execute/n-8422-lits-5840-prev-168095-2298675-433830-win-4194304.blk-32         100065        96156         -3.91%
   Benchmark_seqdec_execute/n-1000-lits-1057-prev-21887-92-217-win-8388608.blk-32                  8119          7373          -9.19%
   Benchmark_seqdec_execute/n-15134-lits-20798-prev-4882976-4884216-4474622-win-8388608.blk-32     84669         83034         -1.93%
   Benchmark_seqdec_execute/n-2-lits-0-prev-620601-689171-848-win-8388608.blk-32                   2914          2773          -4.84%
   Benchmark_seqdec_execute/n-90-lits-67-prev-19498-23-19710-win-8388608.blk-32                    4318          3824          -11.44%
   Benchmark_seqdec_execute/n-931-lits-1179-prev-36502-1526-1518-win-8388608.blk-32                7851          7203          -8.25%
   Benchmark_seqdec_execute/n-2898-lits-4062-prev-335-386-751-win-8388608.blk-32                   15161         14315         -5.58%
   Benchmark_seqdec_execute/n-4056-lits-12419-prev-10792-66-309849-win-8388608.blk-32              23920         20065         -16.12%
   Benchmark_seqdec_execute/n-8028-lits-4568-prev-917-65-920-win-8388608.blk-32                    53268         52768         -0.94%
   ```

   

   klauspost committed May 9, 2022
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