// is on the left hand side, so rewrite "" cmp x to x cmp "".
		// See issue 24817.
		if ir.IsConst(n.X, constant.String) {
			cmp = brrev(cmp)
		}

		// maxRewriteLen was chosen empirically.
		// It is the value that minimizes cmd/go file size
		// across most architectures.
		// See the commit description for CL 26758 for details.
		maxRewriteLen := 6