openjdk: add missing workspace arg to hostspot_gc target (#5478)

Author: zzambers

openjdk/playlist.xml

@@ -278,6 +278,7 @@
 		<testCaseName>hotspot_gc</testCaseName>
 		<command>$(JAVA_COMMAND) -Xmx512m -jar $(Q)$(TEST_RESROOT)$(D)jtreg$(D)lib$(D)jtreg.jar$(Q) \
 	$(JTREG_BASIC_OPTIONS) $(JVM_NATIVE_OPTIONS) -vmoptions:$(Q)-Xmx512m $(JVM_OPTIONS) $(VMOPTION_HEADLESS)$(Q) \
+	-w $(Q)$(REPORTDIR)$(D)work$(Q) \
 	-r $(Q)$(REPORTDIR)$(D)report$(Q) \
 	-jdk:$(Q)$(TEST_JDK_HOME)$(Q) \
 	-exclude:$(Q)$(JTREG_HOTSPOT_TEST_DIR)$(D)ProblemList.txt$(Q) \