[GC] Fix a test failure on G1 Concurrent GC MXBean #842

Job	Run time
Prerequisites	54s
Linux aarch64 (build release)	14m 10s
Windows x64 (build release)	44m 14s
Linux aarch64 (build debug)	15m 15s
Linux x64 (build release)	23m 37s
Windows x64 (build debug)	44m 49s
Linux additional	0s
Linux x64 (build debug)	26m 57s
macOS aarch64 (build release)	3m 20s
macOS x64 (build release)	2m 43s
macOS x64 (build debug)	2m 44s
macOS aarch64 (build debug)	2m 54s
macOS x64	0s
Linux aarch64 (jdk/tier1 part 1)	4m 48s
Linux aarch64 (jdk/tier1 part 2)	7m 31s
Linux aarch64 (jdk/tier1 part 3)	3m 42s
Linux aarch64 (langtools/tier1)	6m 36s
Linux aarch64 (hs/tier1 common)	2m 55s
Linux aarch64 (hs/tier1 compiler)	14m 35s
Linux aarch64 (hs/tier1 gc)	10m 8s
Linux aarch64 (hs/tier1 runtime)	5m 23s
Linux aarch64 (hs/tier1 serviceability)	3m 20s
Linux aarch64 (dragonwell/hs feature)	5m 6s
Linux aarch64 (dragonwell/jdk feature)	2m 59s
Linux x64 (jdk/tier1 part 1)	10m 48s
Linux x64 (jdk/tier1 part 2)	10m 17s
Linux x64 (jdk/tier1 part 3)	4m 14s
Linux x64 (langtools/tier1)	18m 55s
Linux x64 (hs/tier1 common)	1m 46s
Linux x64 (hs/tier1 compiler)	21m 29s
Linux x64 (hs/tier1 gc)	22m 10s
Linux x64 (hs/tier1 runtime)	6m 40s
Linux x64 (hs/tier1 serviceability)	3m 21s
Linux x64 (dragonwell/hs feature)	4m 50s
Linux x64 (dragonwell/jdk feature)	4m 29s
Windows x64 (jdk/tier1 part 1)	14m 31s
Windows x64 (jdk/tier1 part 2)	14m 8s
Windows x64 (jdk/tier1 part 3)	7m 7s
Windows x64 (hs/tier1 common)	3m 25s
Post-process artifacts	19s
	6h 37m 9s

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