Misc. preparations for multi-core support.

hercules_cg/src/rt.rs

hercules_ir/src/dot.rs

hercules_ir/src/einsum.rs

hercules_ir/src/fork_join_analysis.rs

hercules_opt/src/ccp.rs

hercules_opt/src/fork_transforms.rs

hercules_opt/src/forkify.rs

hercules_rt/Cargo.toml

hercules_rt/src/lib.rs

hercules_rt/src/rtdefs.cu

juno_samples/fork_join_tests/src/cpu.sch

juno_samples/fork_join_tests/src/fork_join_tests.jn

juno_samples/fork_join_tests/src/gpu.sch

juno_samples/fork_join_tests/src/main.rs

juno_scheduler/src/lib.rs

juno_scheduler/src/pm.rs