JIT proof of concept using stencils and tiny assembler. #400

Job	Run time
host=ubuntu-22.04 cmd=cli target=x86_64-linux-gnu mode=release	2m 24s
host=ubuntu-22.04 cmd=cli target=x86_64-selinux-gnu mode=release	1m 52s
host=macos-12 cmd=cli target=x86_64-macos-none mode=release	2m 16s
host=macos-12 cmd=cli target=aarch64-macos-none mode=release	2m 36s
host=windows-2022 cmd=cli target=x86_64-windows-gnu mode=release	3m 26s
host=windows-2022 cmd=lib target=x86_64-windows-gnu mode=release	1m 48s
host=ubuntu-22.04 cmd=web-lib target=wasm32-freestanding mode=release	1m 57s
host=ubuntu-22.04 cmd=lib target=x86_64-linux-gnu mode=release	1m 17s
host=macos-12 cmd=lib target=x86_64-macos-none mode=release	1m 25s
host=macos-12 cmd=lib target=aarch64-macos-none mode=release	1m 8s
Release	13s
	20m 22s

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