clean up warnings when building in release mode

llvm-svn: 20658
diff --git a/llvm/lib/Target/IA64/IA64ISelPattern.cpp b/llvm/lib/Target/IA64/IA64ISelPattern.cpp
index 09cb1ce..b6c0fca 100644
--- a/llvm/lib/Target/IA64/IA64ISelPattern.cpp
+++ b/llvm/lib/Target/IA64/IA64ISelPattern.cpp
@@ -319,6 +319,7 @@
                const Type *ArgTy, SelectionDAG &DAG) {
  
   assert(0 && "LowerVAArgNext not done yet!\n");
+  abort();
 }
                
 
@@ -327,6 +328,7 @@
                         SelectionDAG &DAG) {
 
   assert(0 && "LowerFrameReturnAddress not done yet\n");
+  abort();
 }