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

Remove the old functions.

llvm-svn: 202636
diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index d9b0cca..26cfc62 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -139,7 +139,7 @@
   // Figure out the block number this should have.
   unsigned BlockNo = 0;
   if (MBBI != begin())
-    BlockNo = prior(MBBI)->getNumber()+1;
+    BlockNo = std::prev(MBBI)->getNumber() + 1;
 
   for (; MBBI != E; ++MBBI, ++BlockNo) {
     if (MBBI->getNumber() != (int)BlockNo) {
@@ -346,7 +346,7 @@
       OS << PrintReg(I->first, TRI);
       if (I->second)
         OS << " in " << PrintReg(I->second, TRI);
-      if (llvm::next(I) != E)
+      if (std::next(I) != E)
         OS << ", ";
     }
     OS << '\n';