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feat: accelerator support — device translation units, the accelerator dimension of artifact identity, and the host-compiler pairing #1598

Job	Run time
toolchain: musl + llvm	9m 3s
toolchain: gcc (cold self-host)	9m 33s
integration: mcpp builds & runs xlings	9m 9s
build + unit tests (linux x86_64, self-host)	9m 34s
	37m 19s