7171936: LOG_G incorrectly defined in globalDefinitions.hpp Summary: Removed LOG_G and LOG_K. Moved LOG_M to where it is being used. Reviewed-by: twisti, johnc

7143858: G1: Back to back young GCs with the second GC having a minimally sized eden Summary: Before the last thread to leave a JNI critical region was able to schedule a GCLocker Initiated GC, another thread was attempting an allocation and saw that the GCLocker region was no longer active and successfully scheduled a GC. Stall allocating threads until the GCLocker Initiated GC is performed and then retry the allocation. Reviewed-by: brutisso, huntch