Add support for new style casts


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@694 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/ConstantProp.cpp b/lib/Transforms/Scalar/ConstantProp.cpp
index fdf58cb..8b87916 100644
--- a/lib/Transforms/Scalar/ConstantProp.cpp
+++ b/lib/Transforms/Scalar/ConstantProp.cpp
@@ -85,8 +85,8 @@
   if (T->getOpcode() == Instruction::Br) {
     BranchInst *BI = (BranchInst*)T;
     if (BI->isUnconditional()) return false;  // Can't optimize uncond branch
-    BasicBlock *Dest1 = BI->getOperand(0)->castBasicBlockAsserting();
-    BasicBlock *Dest2 = BI->getOperand(1)->castBasicBlockAsserting();
+    BasicBlock *Dest1 = cast<BasicBlock>(BI->getOperand(0));
+    BasicBlock *Dest2 = cast<BasicBlock>(BI->getOperand(1));
 
     if (BI->getCondition()->isConstant()) {    // Are we branching on constant?
       // YES.  Change to unconditional branch...