RFR: (XS) 8129430 - tests that requrie G1 should be excluded from execution on embedded platfomrs where g1 is not supported

[Dmitrij Pochepko]

Hi,

Please take a look at small fix into TEST.groups

Description:
a "needs_g1gc" group description has a bug - missing "\" symbol at the 
end of string, which is not last.
This error leads to wrong groups definitions. So, a simple fix is to add 
this symbol.

A bug: https://bugs.openjdk.java.net/browse/JDK-8129430
A webrev: http://cr.openjdk.java.net/~dpochepk/8129430/webrev.01/

Thanks,
Dmitrij