[Floo] Implement correct directions of links and indexing #1942

Job	Run time
tc-gcc	27s
check-opcodes	4s
tc-llvm	48s
verilator	7s
riscv-isa-sim	9s
verilator-model (minpool)	30s
verilator-model (mempool)	15s
check-bootrom	10s
build-apps-gcc (minpool)	1m 2s
build-apps-gcc (mempool)	1m 4s
unit-test	0s
build-apps-llvm (minpool)	1m 4s
tc-halide	8s
build-apps-llvm (mempool)	52s
build-apps-halide (minpool)	37s
build-apps-halide (mempool)	37s
run-apps-gcc	0s
run-apps-halide	0s
run-apps-llvm	0s
clean-up	2s
clean-up-compile-runs (minpool)	4s
clean-up-compile-runs (mempool)	3s
	8m 3s

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