RFR(xs): 8153396: Remove unused ResourceMarks from UL internal vm tests

[Robbin Ehn]

Hi all,

Please review,

Webrev: http://cr.openjdk.java.net/~rehn/8153396/webrev/
Bug: https://bugs.openjdk.java.net/browse/JDK-8153396

Tested with internal vm test.

Thanks!

/Robbin