[BranchFolding] Change function name related with merging MMOs. NFC

[flyingforyou]

Summary

Removing MMOs is not our prefer behavior any more.

[flyingforyou]

ping?

[mcrosier]

LGTM.

[flyingforyou]

Thanks Chad.!
Commited in r262580.

llvm/trunk/lib/CodeGen/BranchFolding.cpp

bool BranchFolder::CreateCommonTailOnlyBlock(MachineBasicBlock *&PredBB,
   // If we split PredBB, newMBB is the new predecessor.
   if (PredBB == MBB)
     PredBB = newMBB;
 
   return true;
 }
 
 static void
-removeMMOsFromMemoryOperations(MachineBasicBlock::iterator MBBIStartPos,
-                               MachineBasicBlock &MBBCommon) {
-  // Remove MMOs from memory operations in the common block
-  // when they do not match the ones from the block being tail-merged.
-  // This ensures later passes conservatively compute dependencies.
+mergeMMOsFromMemoryOperations(MachineBasicBlock::iterator MBBIStartPos,
+  // Merge MMOs from memory operations in the common block.
   MachineBasicBlock *MBB = MBBIStartPos->getParent();
   // Note CommonTailLen does not necessarily matches the size of
   // the common BB nor all its instructions because of debug
   // instructions differences.
   unsigned CommonTailLen = 0;
   for (auto E = MBB->end(); MBBIStartPos != E; ++MBBIStartPos)
     ++CommonTailLen;
 
while (MergePotentials.size() > 1) {
     // Traversal must be forwards so erases work.
     DEBUG(dbgs() << "\nUsing common tail in BB#" << MBB->getNumber()
                  << " for ");
     for (unsigned int i=0, e = SameTails.size(); i != e; ++i) {
       if (commonTailIndex == i)
         continue;
       DEBUG(dbgs() << "BB#" << SameTails[i].getBlock()->getNumber()
                    << (i == e-1 ? "" : ", "));
-      // Remove MMOs from memory operations as needed.
-      removeMMOsFromMemoryOperations(SameTails[i].getTailStartPos(), *MBB);
+      // Merge MMOs from memory operations as needed.
+      mergeMMOsFromMemoryOperations(SameTails[i].getTailStartPos(), *MBB);
       // Hack the end off BB i, making it jump to BB commonTailIndex instead.
       ReplaceTailWithBranchTo(SameTails[i].getTailStartPos(), MBB);
       // BB i is no longer a predecessor of SuccBB; remove it from the worklist.
       MergePotentials.erase(SameTails[i].getMPIter());
     }
     DEBUG(dbgs() << "\n");
     // We leave commonTailIndex in the worklist in case there are other blocks
     // that match it with a smaller number of instructions.