[Backport] 8307352: AARCH64: Improve itable_stub #1

Job	Run time
Prerequisites	1m 16s
Linux additional	0s
Linux x64 (build release)	23m 33s
macOS aarch64 (build release)	52m 1s
Linux x64 (build debug)	26m 55s
Linux aarch64 (build release)	1s
macOS aarch64 (build debug)	58m 43s
Linux aarch64 (build debug)	1s
macOS x64 (build release)	40m 57s
macOS x64 (build debug)	43m 45s
Windows x64 (build release)	35m 19s
Windows x64 (build debug)	36m 3s
Linux x64 (jdk/tier1 part 1)	10m 43s
Linux x64 (jdk/tier1 part 2)	10m 8s
Linux x64 (jdk/tier1 part 3)	4m 20s
Linux x64 (langtools/tier1)	19m 8s
Linux x64 (hs/tier1 common)	1m 47s
Linux x64 (hs/tier1 compiler)	21m 24s
Linux x64 (hs/tier1 gc)	22m 32s
Linux x64 (hs/tier1 runtime)	6m 49s
Linux x64 (hs/tier1 serviceability)	3m 18s
Linux x64 (dragonwell/hs feature)	4m 55s
Linux x64 (dragonwell/jdk feature)	4m 24s
Windows x64 (jdk/tier1 part 1)	14m 57s
Windows x64 (jdk/tier1 part 2)	12m 57s
Windows x64 (jdk/tier1 part 3)	5m 57s
Windows x64 (hs/tier1 common)	3m 8s
macOS x64 (jdk/tier1 part 1)	19m 59s
macOS x64 (jdk/tier1 part 2)	17m 22s
macOS x64 (jdk/tier1 part 3)	7m 52s
macOS x64 (hs/tier1 common)	2m 58s
Linux aarch64	1s
Post-process artifacts	14s
	8h 33m 27s

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