const compress/flate.hashMask

4 uses

	compress/flate (current package)
		deflate.go#L55: 	hashMask            = (1 << hashBits) - 1
		deflate.go#L218: 			hh := &d.hashHead[val&hashMask]
		deflate.go#L422: 			hh := &d.hashHead[hash&hashMask]
		deflate.go#L470: 						hh := &d.hashHead[hash&hashMask]