Commits on Apr 4, 2022

1. zstd: Store previous offsets in registers …

   Not super visible in microbenches (presumably because of cache), but very visible in streaming decodes.
   
   Before/after:
   
   ```
   BenchmarkDecoderSilesia-32    	       4	 281168525 ns/op	 753.81 MB/s	   50218 B/op	      44 allocs/op
   BenchmarkDecoderSilesia-32    	       6	 190584583 ns/op	1112.09 MB/s	   49446 B/op	      45 allocs/op
   
   BenchmarkDecoderEnwik9-32    	       1	1439964200 ns/op	 694.46 MB/s	   71952 B/op	      51 allocs/op
   BenchmarkDecoderEnwik9-32    	       1	1184307200 ns/op	 844.38 MB/s	   72144 B/op	      53 allocs/op
   ```

   

   klauspost committed Apr 4, 2022
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