const unicode/utf8.t4

3 uses

	unicode/utf8 (current package)
		utf8.go#L33: 	t4 = 0b11110000
		utf8.go#L364: 		p[0] = t4 | byte(r>>18)
		utf8.go#L394: 		return append(p, t4|byte(r>>18), tx|byte(r>>12)&maskx, tx|byte(r>>6)&maskx, tx|byte(r)&maskx)