RFR: JDK-8235339: test TargetAnnoCombo.java is failing after new target RECORD_COMPONENT was added

[Vicente Romero]

Hi,

Please review the fix for [1] at [2]. Records added a new annotation 
target: RECORD_COMPONENT. This combo test is generating several 
combinations of tests with repeated annotations. When some combinations 
were adding the new target, then they were failing as the incantation to 
use preview features was not being used. I also changed the method that 
return the default set of annotation targets to don't return 
RECORD_COMPONENT if records are not allowed.

Thanks,
Vicente

[1] https://bugs.openjdk.java.net/browse/JDK-8235339
[2] http://cr.openjdk.java.net/~vromero/8235339/webrev.00/