remove redundent log

Author: rez5427

llvm/lib/CodeGen/RegisterCoalescer.cpp

@@ -1328,8 +1328,6 @@ bool RegisterCoalescer::reMaterializeDef(const CoalescerPair &CP,
 
   // Skip rematerialization for physical registers used as return values within
   // the same basic block to enable better coalescing.
-  
-    
   if (DstReg.isPhysical()) {
     MachineBasicBlock *MBB = CopyMI->getParent();
     if (DefMI->getParent() == MBB) {
@@ -1366,7 +1364,7 @@ bool RegisterCoalescer::reMaterializeDef(const CoalescerPair &CP,
               bool OnlyUsedByCopies = true;
               unsigned UseCount = 0;
               for (const MachineOperand &MO : MRI->use_operands(SrcReg)) {
-                const MachineInstr *UseMI = MO.getParent();  // 改为 const
+                const MachineInstr *UseMI = MO.getParent();
                 if (!UseMI->isCopy() && !UseMI->isSubregToReg()) {
                   OnlyUsedByCopies = false;
                   break;
@@ -1375,9 +1373,7 @@ bool RegisterCoalescer::reMaterializeDef(const CoalescerPair &CP,
               }
 
               if (OnlyUsedByCopies && UseCount > 0) {
-                LLVM_DEBUG(dbgs() << "\tAllow remat: constant move only used by "
-                                  << UseCount << " copies\n");
-                break; // Allow rematerialization
+                break;
               }
             }