Fix some Window-isms to get these tests to pass on Windows.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@85450 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/return.c b/test/Sema/return.c
index 64def30..cdd3105 100644
--- a/test/Sema/return.c
+++ b/test/Sema/return.c
@@ -203,7 +203,11 @@
   if (j)
     longjmp(test30_j, 1);
   else
+#if defined(_WIN32) || defined(_WIN64)
+    longjmp(test30_j, 2);
+#else
     _longjmp(test30_j, 1);
+#endif
 }
 
 typedef void test31_t(int status);