[MBP] Remove unused declaration shouldPredBlockBeOutlined (NFC)

The function was introduced on Jun 12, 2016 in commit
071d0f180794f7819c44026815614ce8fa00a3bd.  Its definition was removed
on Mar 2, 2017 in commit 1393761e0ca3fe8271245762f78daf4d5208cd77.

diff --git a/llvm/lib/CodeGen/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 8a86696..461a737 100644 (file)
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -449,10 +449,6 @@ class MachineBlockPlacement : public MachineFunctionPass {
       const MachineBasicBlock *BB, const BlockChain &Chain,
       const BlockFilterSet *BlockFilter,
       SmallVector<MachineBasicBlock *, 4> &Successors);
-  bool shouldPredBlockBeOutlined(
-      const MachineBasicBlock *BB, const MachineBasicBlock *Succ,
-      const BlockChain &Chain, const BlockFilterSet *BlockFilter,
-      BranchProbability SuccProb, BranchProbability HotProb);
   bool isBestSuccessor(MachineBasicBlock *BB, MachineBasicBlock *Pred,
                        BlockFilterSet *BlockFilter);
   void findDuplicateCandidates(SmallVectorImpl<MachineBasicBlock *> &Candidates,