[GC] Fix option type in IOPrioritySizePolicy #490

Job	Run time
Prerequisites / Prerequisites	1s
Prerequisites / check_commit	1m 35s
linux-aarch64 / build (fastdebug)	10m 4s
linux-aarch64 / build (release)	10m 3s
linux-x64 / build (fastdebug)	12m 16s
linux-x64 / build (release)	10m 48s
linux-aarch64 / test (jdk_tier1)	5m 25s
linux-aarch64 / test (dragonwell_jdk_features)	1m 27s
linux-aarch64 / test (hotspot_tier1)	8m 19s
linux-aarch64 / test (hotspot_jwarmup)	2m 12s
linux-aarch64 / test (hotspot_elastic_heap)	4m 16s
linux-aarch64 / test (hotspot_multi_tenant)	4s
linux-x64 / test (jdk_tier1)	13m 49s
linux-x64 / test (dragonwell_jdk_features)	3m 6s
linux-x64 / test (hotspot_tier1)	18m 31s
linux-x64 / test (hotspot_jwarmup)	2m 42s
linux-x64 / test (hotspot_elastic_heap)	8m 54s
linux-x64 / test (hotspot_multi_tenant)	1m 14s
Remove bundle artifacts	3s
	1h 54m 49s

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