RFR(s): 8153731: Increase max tag combinations for UL expression (config)

[Robbin Ehn]

Hi all,

Please review,

Webrev: http://cr.openjdk.java.net/~rehn/8153731/webrev/
Bug: https://bugs.openjdk.java.net/browse/JDK-8153731

Tested with internal vm test (inc a new test for just this).

Thanks!

/Robbin