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feat: accelerator support — device translation units, the accelerator dimension of artifact identity, and the host-compiler pairing #1599

Job	Run time
integration: mcpp builds & runs xlings	1m 13s
build + unit tests (linux x86_64, self-host)	1m 12s
toolchain: gcc (cold self-host)	1m 11s
toolchain: musl + llvm	1m 9s
	4m 45s