8371141: Shenandoah: Many test timeouts with -XX:-UseTLAB

Reviewed-by: xpeng, ysr, wkemper

Author: kdnilsen

test/hotspot/jtreg/ProblemList.txt

@@ -94,6 +94,9 @@ gc/TestAllocHumongousFragment.java#g1 8298781 generic-all
 gc/TestAllocHumongousFragment.java#static 8298781 generic-all
 gc/shenandoah/oom/TestAllocOutOfMemory.java#large 8344312 linux-ppc64le
 gc/shenandoah/TestEvilSyncBug.java#generational 8345501 generic-all
+gc/shenandoah/TestRetainObjects.java#no-tlab 8361099 generic-all
+gc/shenandoah/TestSieveObjects.java#no-tlab 8361099 generic-all
+gc/shenandoah/TestSieveObjects.java#no-tlab-genshen 8361099 generic-all
 
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