Anti-dependencies rewrite

Cargo.toml

hercules_cg/src/cpu.rs

hercules_cg/src/rt.rs

hercules_ir/src/antideps.rs

hercules_ir/src/collections.rs

hercules_opt/src/lib.rs

hercules_opt/src/materialize_clones.rs

hercules_opt/src/pass.rs

juno_samples/implicit_clone/Cargo.toml

juno_samples/implicit_clone/build.rs

juno_samples/implicit_clone/src/implicit_clone.jn

juno_samples/implicit_clone/src/main.rs