[software] Save simulation outputs #1966

Job	Run time
check-opcodes	3s
riscv-isa-sim	6s
tc-gcc	23s
tc-llvm	52s
verilator	9s
verilator-model (minpool)	8s
verilator-model (mempool)	8s
check-bootrom	12s
build-apps-gcc (minpool)	18s
build-apps-gcc (mempool)	17s
unit-test	2m 0s
build-apps-llvm (minpool)	31s
tc-halide	10s
build-apps-llvm (mempool)	36s
run-apps-gcc	0s
build-apps-halide (minpool)	2m 40s
build-apps-halide (mempool)	1m 22s
run-apps-llvm	0s
run-apps-halide (minpool)	10s
run-apps-halide (mempool)	12s
clean-up-compile-runs (minpool)	2s
clean-up	2s
clean-up-compile-runs (mempool)	3s
	10m 24s

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