Remove unneeded const_cast.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136506 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 7d45d29..329fb51 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -1277,8 +1277,8 @@
   BranchProbabilityInfo *BPI = FuncInfo.BPI;
   if (!BPI)
     return 0;
-  BasicBlock *SrcBB = const_cast<BasicBlock*>(Src->getBasicBlock());
-  BasicBlock *DstBB = const_cast<BasicBlock*>(Dst->getBasicBlock());
+  const BasicBlock *SrcBB = Src->getBasicBlock();
+  const BasicBlock *DstBB = Dst->getBasicBlock();
   return BPI->getEdgeWeight(SrcBB, DstBB);
 }