[C++11] Replace llvm::next and llvm::prior with std::next and std::prev.

Remove the old functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202636 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/StackSlotColoring.cpp

@@ -385,8 +385,8 @@ bool StackSlotColoring::RemoveDeadStores(MachineBasicBlock* MBB) {
       toErase.push_back(I);
       continue;
     }
-        
-    MachineBasicBlock::iterator NextMI = llvm::next(I);
+
+    MachineBasicBlock::iterator NextMI = std::next(I);
     if (NextMI == MBB->end()) continue;
 
     unsigned LoadReg = 0;