[NFC] Fix spelling/newlines in comments/debug messages

[dpenry]

Summary

Just a few spelling mistakes and missing newlines

[dmgreen]

LGTM

llvm/lib/CodeGen/MachinePipeliner.cpp

Pass.ORE->emit([&]() {
              << "Invalid Minimal Initiation Interval: 0";
     });
     return;
   }
 
   // Don't pipeline large loops.
   if (SwpMaxMii != -1 && (int)MII > SwpMaxMii) {
     LLVM_DEBUG(dbgs() << "MII > " << SwpMaxMii
-                      << ", we don't pipleline large loops\n");
+                      << ", we don't pipeline large loops\n");
     NumFailLargeMaxMII++;
     Pass.ORE->emit([&]() {
       return MachineOptimizationRemarkAnalysis(
                  DEBUG_TYPE, "schedule", Loop.getStartLoc(), Loop.getHeader())
              << "Minimal Initiation Interval too large: "
              << ore::NV("MII", (int)MII) << " > "
              << ore::NV("SwpMaxMii", SwpMaxMii) << "."
              << "Refer to -pipeliner-max-mii.";
for (auto &SU : SUnits) {
       ArrayRef<PressureChange> CriticalPSets;
       RecRPTracker.getMaxUpwardPressureDelta(SU->getInstr(), nullptr, RPDelta,
                                              CriticalPSets,
                                              RecRegPressure.MaxSetPressure);
       if (RPDelta.Excess.isValid()) {
         LLVM_DEBUG(
             dbgs() << "Excess register pressure: SU(" << SU->NodeNum << ") "
                    << TRI->getRegPressureSetName(RPDelta.Excess.getPSet())
-                   << ":" << RPDelta.Excess.getUnitInc());
+                   << ":" << RPDelta.Excess.getUnitInc() << "\n");
         NS.setExceedPressure(SU);
         break;
       }
       RecRPTracker.recede();
     }
   }
 }
 

llvm/lib/CodeGen/ModuloSchedule.cpp

if (Schedule.getStage(LoopDef) > (signed)InstStageNum)
       NewOffset += RegAndOffset.second * (CurStageNum - InstStageNum);
     NewMI->getOperand(OffsetPos).setImm(NewOffset);
   }
   updateMemOperands(*NewMI, *OldMI, CurStageNum - InstStageNum);
   return NewMI;
 }
 
 /// Update the machine instruction with new virtual registers.  This
-/// function may change the defintions and/or uses.
+/// function may change the definitions and/or uses.
 void ModuloScheduleExpander::updateInstruction(MachineInstr *NewMI,
                                                bool LastDef,
                                                unsigned CurStageNum,
                                                unsigned InstrStageNum,
                                                ValueMapTy *VRMap) {
   for (MachineOperand &MO : NewMI->operands()) {
     if (!MO.isReg() || !Register::isVirtualRegister(MO.getReg()))
       continue;