const unicode/utf8.t3

3 uses

	unicode/utf8 (current package)
		utf8.go#L32: 	t3 = 0b11100000
		utf8.go#L358: 		p[0] = t3 | byte(r>>12)
		utf8.go#L392: 		return append(p, t3|byte(r>>12), tx|byte(r>>6)&maskx, tx|byte(r)&maskx)