Fix a compile error on compilers that still want a return value
in a non-void function that calls abort.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50969 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 307aeae..4e3db7e 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -4987,6 +4987,7 @@
 
   assert(0 && "VAArgInst is not yet implemented for x86-64!");
   abort();
+  return SDOperand();
 }
 
 SDOperand X86TargetLowering::LowerVACOPY(SDOperand Op, SelectionDAG &DAG) {