Prevent rewriter crash when variable type is missing.
Fixes radar 7692183.

llvm-svn: 97281
diff --git a/clang/test/Rewriter/rewrite-byref-in-nested-blocks.mm b/clang/test/Rewriter/rewrite-byref-in-nested-blocks.mm
index c6279de..a8f5b14 100644
--- a/clang/test/Rewriter/rewrite-byref-in-nested-blocks.mm
+++ b/clang/test/Rewriter/rewrite-byref-in-nested-blocks.mm
@@ -13,10 +13,13 @@
 @implementation X
 - (void)foo {
         __block int kerfluffle;
+        // radar 7692183
+        __block x; 
         f(^{
                 f(^{
                                 y = 42;
                             kerfluffle = 1;
+			    x = 2;
                 });
         });
 }