Fix a warning


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23031 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelPattern.cpp b/lib/Target/X86/X86ISelPattern.cpp
index 0ebd629..ff0ee63 100644
--- a/lib/Target/X86/X86ISelPattern.cpp
+++ b/lib/Target/X86/X86ISelPattern.cpp
@@ -3984,6 +3984,7 @@
                                            SelectionDAG &DAG) {
   MVT::ValueType StoreVT;
   switch (Chain.getOpcode()) {
+  default: assert(0 && "Unexpected node!");
   case ISD::CALLSEQ_START:
     // If we found the start of the call sequence, we're done.  We actually
     // strip off the CALLSEQ_START node, to avoid generating the