AMDGPU/SI: Add a new line after a debug message

[axeldavy]

Summary

There was a missing line jump at the end of a debug message
for the SI scheduler.

[arsenm]

LGTM

llvm/trunk/lib/Target/AMDGPU/SIMachineScheduler.cpp

while (SIScheduleBlock *Block = pickBlock()) {
     blockScheduled(Block);
   }
 
   DEBUG(
     dbgs() << "Block Order:";
     for (SIScheduleBlock* Block : BlocksScheduled) {
       dbgs() << ' ' << Block->getID();
     }
+    dbgs() << '\n';
   );
 }
 
 bool SIScheduleBlockScheduler::tryCandidateLatency(SIBlockSchedCandidate &Cand,
                                                    SIBlockSchedCandidate &TryCand) {
   if (!Cand.isValid()) {
     TryCand.Reason = NodeOrder;
     return true;