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One C++ runtime per process, the graph and pack facts, bounded offlin… #1698

Job	Run time
bare-metal e2e (riscv64-none-elf + cortex-m, qemu)	6m 50s
hermetic e2e (no host toolchain, container)	10m 46s
android e2e (NDK rows + x86_64 emulator)	10m 13s
e2e 1/2 (linux x86_64, self-host)	18m 24s
e2e 2/2 (linux x86_64, self-host)	20m 58s
	1h 7m 11s