RFR (xxs, test): 8146889: Update @requires expression for GC tests to run if GC is default

[Thomas Schatzl]

Hi,

On Tue, 2016-01-12 at 18:01 +0300, Dmitry Fazunenko wrote:
> Hello,
> 
> may I have a couple reviews of a trivial change enabling two tests
> when 
> no GC is explicitly specified.
> 
> http://cr.openjdk.java.net/~dfazunen/8146889/webrev.00/
> https://bugs.openjdk.java.net/browse/JDK-8146889
> 
> Tested locally.

  looks good.

Thomas