jit: Initial x64 implementation. #402

Job	Run time
host=ubuntu-22.04 cmd=cli target=x86_64-linux-gnu mode=release	1m 2s
host=ubuntu-22.04 cmd=cli target=x86_64-selinux-gnu mode=release	49s
host=macos-12 cmd=cli target=x86_64-macos-none mode=release	1m 31s
host=macos-12 cmd=cli target=aarch64-macos-none mode=release	53s
host=windows-2022 cmd=cli target=x86_64-windows-gnu mode=release	1m 33s
host=windows-2022 cmd=lib target=x86_64-windows-gnu mode=release	2m 5s
host=ubuntu-22.04 cmd=web-lib target=wasm32-freestanding mode=release	54s
host=ubuntu-22.04 cmd=cli target=wasm32-wasi mode=release	51s
host=ubuntu-22.04 cmd=lib target=x86_64-linux-gnu mode=release	1m 7s
host=macos-12 cmd=lib target=x86_64-macos-none mode=release	1m 22s
host=macos-12 cmd=lib target=aarch64-macos-none mode=release	1m 11s
Release	0s
	13m 18s

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