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feat: accelerator support — device translation units, the accelerator dimension of artifact identity, and the host-compiler pairing #1593

Job	Run time
build + unit tests (linux x86_64, self-host)	14m 59s
integration: mcpp builds & runs xlings	8m 55s
toolchain: musl + llvm	7m 17s
toolchain: gcc (cold self-host)	6m 15s
	37m 26s