Use dyn_cast instead of isa and cast. No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169196 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 5f921c4..ca25274 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -1006,12 +1006,12 @@
 
       if (AllPredsVisited) {
         for (BasicBlock::const_iterator I = LLVMBB->begin();
-             isa<PHINode>(I); ++I)
-          FuncInfo->ComputePHILiveOutRegInfo(cast<PHINode>(I));
+             const PHINode *PN = dyn_cast<PHINode>(I); ++I)
+          FuncInfo->ComputePHILiveOutRegInfo(PN);
       } else {
         for (BasicBlock::const_iterator I = LLVMBB->begin();
-             isa<PHINode>(I); ++I)
-          FuncInfo->InvalidatePHILiveOutRegInfo(cast<PHINode>(I));
+             const PHINode *PN = dyn_cast<PHINode>(I); ++I)
+          FuncInfo->InvalidatePHILiveOutRegInfo(PN);
       }
 
       FuncInfo->VisitedBBs.insert(LLVMBB);