This PR proposes to add `Stop` and `ErrorStop` PRIF call procedures to the MIF
dialect. If the `-fcoarray` flag is passed, then all calls to `STOP` and `ERROR
STOP` will use those of PRIF in flang-rt. Thes procedure has been registered
during the initialization (mif::InitOp).
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Co-authored-by: Dan Bonachea <dobonachea@lbl.gov>