Fix anti-dependencies, factor out block ordering

Cargo.lock

Cargo.toml

hercules_cg/src/cpu.rs

hercules_cg/src/rt.rs

hercules_ir/src/antideps.rs

hercules_ir/src/dot.rs

hercules_ir/src/gcm.rs

hercules_opt/src/pass.rs

juno_samples/antideps/Cargo.toml

juno_samples/antideps/build.rs

juno_samples/antideps/src/antideps.jn

juno_samples/antideps/src/main.rs

juno_samples/implicit_clone/src/implicit_clone.jn

juno_samples/implicit_clone/src/main.rs