feat(bench): cross-platform benchmark suite, and the defects it expos… #1029

Job	Run time
integration: mcpp builds & runs xlings	9m 14s
toolchain: musl + llvm	9m 17s
build + unit tests (linux x86_64, self-host)	12m 0s
toolchain: gcc (cold self-host)	8m 40s
	39m 11s

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