Commits on Nov 30, 2022

1. zstd: Use individual reset threshold …

   Instead of setting the limit to the largest window size, set it to the chosen one.
   
   ```
   λ benchcmp before.txt after.txt
   benchmark                                         old ns/op     new ns/op     delta
   BenchmarkEncoder_EncodeAllSimple4K/fastest-32     3145          3133          -0.38%
   BenchmarkEncoder_EncodeAllSimple4K/default-32     41485         40624         -2.08%
   BenchmarkEncoder_EncodeAllSimple4K/better-32      49352         49197         -0.31%
   BenchmarkEncoder_EncodeAllSimple4K/best-32        421522        407392        -3.35%
   
   benchmark                                         old MB/s     new MB/s     speedup
   BenchmarkEncoder_EncodeAllSimple4K/fastest-32     1302.48      1307.39      1.00x
   BenchmarkEncoder_EncodeAllSimple4K/default-32     98.74        100.83       1.02x
   BenchmarkEncoder_EncodeAllSimple4K/better-32      83.00        83.26        1.00x
   BenchmarkEncoder_EncodeAllSimple4K/best-32        9.72         10.05        1.03x
   ```

   

   klauspost committed Nov 30, 2022
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2. Ensure 2 windows.

   

   klauspost committed Nov 30, 2022
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3. Account for hist size when protecting against wraps.

   

   klauspost committed Nov 30, 2022
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4. Keep two windows

   

   klauspost committed Nov 30, 2022
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