gc_epilogue(full = false) is called on Full GC path after JDK-8215221

gc/arguments/TestSurvivorRatioFlag.java fails after JDK-8215221 with Serial GC with

# after -XX: or in .hotspotrc: SuppressErrorAt=/defNewGeneration.cpp:892
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/07fc96ef-bf4d-487f-b22f-a84e49f5f44a-S31990/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/2a60951b-36cf-4d2a-a452-7fcb424f7be8/runs/0b75d738-322f-4c76-83d3-db93a0ee84b4/workspace/open/src/hotspot/share/gc/serial/defNewGeneration.cpp:892), pid=27280, tid=27288
# assert(gch->gc_cause() == GCCause::_scavenge_alot || (GCCause::is_user_requested_gc(gch->gc_cause()) && UseConcMarkSweepGC && ExplicitGCInvokesConcurrent) || !gch->incremental_collection_failed()) failed: Twice in a row
#
# JRE version: Java(TM) SE Runtime Environment (13.0) (fastdebug build 13-internal+0-jdk13-jdk.547)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 13-internal+0-jdk13-jdk.547, mixed mode, sharing, tiered, compressed oops, concurrent mark sweep gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xa3afdc] DefNewGeneration::gc_epilogue(bool)+0x34c
#
# Core dump will be written. Default location: [...]
#
Unsupported internal testing APIs have been used.