Remove clear_mem and Op_ClearArray related changes #13

Job	Run time
Prerequisites	54s
Linux aarch64 (build release)	1s
Linux x64 (build release)	36m 27s
macOS aarch64 (build release)	32m 27s
Linux aarch64 (build debug)	1s
Linux x64 (build debug)	26m 23s
macOS aarch64 (build debug)	38m 44s
Linux additional	0s
macOS x64 (build release)	42m 48s
Windows x64 (build release)	1h 0m 59s
macOS x64 (build debug)	43m 5s
Windows x64 (build debug)	36m 41s
Linux x64 (jdk/tier1 part 1)	19m 51s
Linux x64 (jdk/tier1 part 2)	22m 5s
Linux x64 (jdk/tier1 part 3)	7m 2s
Linux x64 (langtools/tier1)	34m 44s
Linux x64 (hs/tier1 common)	2m 16s
Linux x64 (hs/tier1 compiler)	44m 11s
Linux x64 (hs/tier1 gc)	43m 32s
Linux x64 (hs/tier1 runtime)	14m 45s
Linux x64 (hs/tier1 serviceability)	5m 1s
Linux x64 (dragonwell/hs feature)	9m 21s
Linux x64 (dragonwell/jdk feature)	8m 56s
macOS x64 (jdk/tier1 part 1)	20m 55s
macOS x64 (jdk/tier1 part 2)	18m 8s
macOS x64 (jdk/tier1 part 3)	8m 51s
macOS x64 (hs/tier1 common)	2m 58s
Windows x64 (jdk/tier1 part 1)	26m 4s
Windows x64 (jdk/tier1 part 2)	20m 48s
Windows x64 (jdk/tier1 part 3)	8m 43s
Windows x64 (hs/tier1 common)	4m 0s
Linux aarch64	1s
Post-process artifacts	33s
	10h 41m 15s

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