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to schedule a GCLocker Initiated GC, another thread was attempting an allocation and saw that the GCLocker region was no longer active and successfully scheduled a GC.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

os_family = linux

arch = ppc

arch_model = ppc

os_arch = linux_ppc

os_arch_model = linux_ppc

lib_arch = ppc

compiler = gcc

gnu_dis_arch = ppc

sysdefs = -DLINUX -D_GNU_SOURCE -DPPC