Revert "Fix a quadratic algorithm in MachineBranchProbabilityInfo."

It caused an assertion failure when compiling consumer-typeset.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161463 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineBranchProbabilityInfo.h

@@ -16,12 +16,14 @@
 #define LLVM_CODEGEN_MACHINEBRANCHPROBABILITYINFO_H
 
 #include "llvm/Pass.h"
-#include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/Support/BranchProbability.h"
 #include <climits>
 
 namespace llvm {
 
+class raw_ostream;
+class MachineBasicBlock;
+
 class MachineBranchProbabilityInfo : public ImmutablePass {
   virtual void anchor();
 
@@ -50,11 +52,6 @@ public:
   uint32_t getEdgeWeight(const MachineBasicBlock *Src,
                          const MachineBasicBlock *Dst) const;
 
-  // Same thing, but using a const_succ_iterator from Src. This is faster when
-  // the iterator is already available.
-  uint32_t getEdgeWeight(const MachineBasicBlock *Src,
-                         MachineBasicBlock::const_succ_iterator Dst) const;
-
   // Get sum of the block successors' weights, potentially scaling them to fit
   // within 32-bits. If scaling is required, sets Scale based on the necessary
   // adjustment. Any edge weights used with the sum should be divided by Scale.