[flang] Merge pull request flang-compiler/f18#989 from flang-compiler/tsk-forall
Add FORALL checking to DoChecker
Original-commit: flang-compiler/f18@35fd0cda58776389d2ed68eaefbc1e1d59423ec8
Reviewed-on: https://github.com/flang-compiler/f18/pull/989