working on slotmap changes

.vscode/launch.json

.vscode/settings.json

Cargo.lock

hercules_ir/Cargo.toml

hercules_ir/src/antideps.rs

hercules_ir/src/build.rs

hercules_ir/src/dataflow.rs

hercules_ir/src/def_use.rs

hercules_ir/src/dot.rs

hercules_ir/src/gcm.rs

hercules_ir/src/ir.rs

hercules_ir/src/schedule.rs

hercules_ir/src/subgraph.rs

hercules_ir/src/typecheck.rs

hercules_ir/src/verify.rs

hercules_samples/matmul/matmul_int.hir

hercules_samples/sum_sample_int.hir