Misc. clean-up

hercules_cg/Cargo.toml

hercules_cg/src/cpu.rs

hercules_cg/src/device.rs

hercules_cg/src/lib.rs

hercules_cg/src/rt.rs

hercules_ir/Cargo.toml

hercules_ir/src/dataflow.rs

hercules_ir/src/dot.rs

hercules_ir/src/fork_join_analysis.rs

hercules_ir/src/ir.rs

hercules_ir/src/loops.rs

hercules_ir/src/parse.rs

hercules_ir/src/subgraph.rs

hercules_ir/src/verify.rs

hercules_opt/Cargo.toml

hercules_opt/src/ccp.rs

hercules_opt/src/dce.rs

hercules_opt/src/delete_uncalled.rs

hercules_opt/src/editor.rs

hercules_opt/src/float_collections.rs