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feat: accelerator support — device translation units, the accelerator dimension of artifact identity, and the host-compiler pairing #1595

Job	Run time
toolchain: gcc (cold self-host)	5m 1s
integration: mcpp builds & runs xlings	3m 5s
build + unit tests (linux x86_64, self-host)	4m 39s
toolchain: musl + llvm	4m 46s
	17m 31s