Request for reviews (XS): 6893701: compiler/6877254/Test.java fails because it combines -XX:+UseConcMarkSweepGC with other GC

[Vladimir Kozlov]

http://cr.openjdk.java.net/~kvn/6893701/webrev

Fixed 6893701: compiler/6877254/Test.java fails because it combines -XX:+UseConcMarkSweepGC with other GC

Remove explicit GC flags for next tests:
compiler/6877254/Test.java
compiler/6896727/Test.java

Reviewed by:

Fix verified (y/n): y, tests

Other testing:
JPRT