add assert zext/sext to the dag isel


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23171 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
index 9eef4fb..915b9d0 100644
--- a/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
+++ b/lib/Target/PowerPC/PPCISelDAGToDAG.cpp
@@ -642,6 +642,9 @@
     abort();
   case ISD::EntryToken:       // These leaves remain the same.
     return Op;
+  case ISD::AssertSext:
+  case ISD::AssertZext:
+    return Select(N->getOperand(0));
   case ISD::TokenFactor: {
     SDOperand New;
     if (N->getNumOperands() == 2) {