const regexp.maxBacktrackVector

3 uses

	regexp (current package)
		backtrack.go#L33: 	maxBacktrackVector = 256 * 1024 // bit vector size <= max (bits)
		backtrack.go#L68: 	return maxBacktrackVector / len(prog.Inst)
		backtrack.go#L91: 		b.visited = make([]uint32, visitedSize, maxBacktrackVector/visitedBits)