Commits on Sep 25, 2022

1. flate: Improve level 1-3 compression …

   Use 5 byte hash instead of 4 byte hash.
   
   This improves compression in most cases and will also yield faster decompression. Little to no performance impact.
   
   Before/after:
   ```
   file	out	level	insize	outsize	millis
   nyc-taxi-data-10M.csv	gzkp	1	3325605752	922273214	14065	225.49
   nyc-taxi-data-10M.csv	gzkp	1	3325605752	846471964	14564	217.76
   
   nyc-taxi-data-10M.csv	gzkp	2	3325605752	883782053	15683	202.22
   nyc-taxi-data-10M.csv	gzkp	2	3325605752	815766227	15057	210.63
   
   nyc-taxi-data-10M.csv	gzkp	3	3325605752	878726683	17308	183.24
   nyc-taxi-data-10M.csv	gzkp	3	3325605752	807241782	17184	184.56
   
   nyc-taxi-data-10M.csv	gzkp	4	3325605752	789447233	20651	153.57
   nyc-taxi-data-10M.csv	gzkp	4	3325605752	789447233	20862	152.02
   
   file	out	level	insize	outsize	millis	mb/s
   enwik9	gzkp	1	1000000000	382781160	5713	166.90
   enwik9	gzkp	1	1000000000	374131553	5926	160.90
   
   enwik9	gzkp	2	1000000000	371351753	6131	155.55
   enwik9	gzkp	2	1000000000	361881529	6007	158.74
   
   enwik9	gzkp	3	1000000000	364881746	6891	138.39
   enwik9	gzkp	3	1000000000	355065173	7043	135.39
   
   enwik9	gzkp	4	1000000000	342732211	8339	114.36
   enwik9	gzkp	4	1000000000	342732211	8327	114.52
   ```

   

   klauspost committed Sep 25, 2022
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