Restore dump() methods to Loop and MachineLoop.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92772 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineLoopInfo.cpp

@@ -17,6 +17,7 @@
 #include "llvm/CodeGen/MachineLoopInfo.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/Passes.h"
+#include "llvm/Support/Debug.h"
 using namespace llvm;
 
 namespace llvm {
@@ -73,3 +74,7 @@ MachineBasicBlock *MachineLoop::getBottomBlock() {
   }
   return BotMBB;
 }
+
+void MachineLoop::dump() const {
+  print(dbgs());
+}