zstd: Revert table size change (#789)

* zstd: Revert table size change

Can't decide on this one. So leaving it out for now.

* Add fuzz files up to 8K to base set.

Author: klauspost

zstd/enc_best.go

@@ -12,7 +12,7 @@ import (
 )
 
 const (
-	bestLongTableBits = 23                     // Bits used in the long match table
+	bestLongTableBits = 22                     // Bits used in the long match table
 	bestLongTableSize = 1 << bestLongTableBits // Size of the table
 	bestLongLen       = 8                      // Bytes used for table hash