macOS: add `os_sync_wait_on_address` and related definitions #5366

Job	Run time
Docker Linux Tier1 (i686-unknown-linux-gnu)	3m 28s
macOS (x86_64-apple-darwin)	2m 0s
Style check	2m 41s
Docker Linux Tier1 (x86_64-unknown-linux-gnu)	3m 18s
Windows (x86_64-pc-windows-gnu, 64, x86_64)	4m 4s
Windows (x86_64-pc-windows-msvc)	3m 8s
Windows (i686-pc-windows-msvc)	4m 49s
	23m 28s

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