Add codegen support for ObjC message expressions with the GNU runtime.
Patch by David Chisnall!


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@47789 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CodeGen/CGExprConstant.cpp b/CodeGen/CGExprConstant.cpp
index ec16b16..30180c1 100644
--- a/CodeGen/CGExprConstant.cpp
+++ b/CodeGen/CGExprConstant.cpp
@@ -200,6 +200,9 @@
     
     // Make sure we have an array at this point
     assert(0 && "Unable to handle InitListExpr");
+    // Get rid of control reaches end of void function warning.
+    // Not reached.
+    return 0;
   }
 
   llvm::Constant *VisitImplicitCastExpr(ImplicitCastExpr *ICExpr) {