Split hot method ModelChecker#doNext into smaller chunks to facilitate runtime inlining.
Split hot method ModelChecker#doNext into smaller chunks to
facilitate runtime inlining.

Part II: invariants and implied actions checks

[Refactor][TLC]

lemmy/tlaplus,lemmy/tlaplus,tlaplus/tlaplus,tlaplus/tlaplus,tlaplus/tlaplus,lemmy/tlaplus,lemmy/tlaplus,tlaplus/tlaplus