RFR(S) 8210376: [TESTBUG] @requires vm.cds should be replaced by @requires vm.cds.archived.java.heap and documentation is required for vm.gc==null

[Vaibhav Choudhary]

Hi All,

Please review this simple fix which is to replace the @requires vm.cds with @requires vm.cds.archived.java.heap (this also do implicit check for the collector to be G1) and documentation changes.

Bug : https://bugs.openjdk.java.net/browse/JDK-8210376
Webrev: http://cr.openjdk.java.net/~vtewari/vaibhav/8210376/webrev0.1/index.html
Testing: Mach5 (Tier 1-6)

Thanks,
Vaibhav C