Adding RUN lines.

llvm-svn: 17532
diff --git a/llvm/test/Regression/CFrontend/2003-08-23-LocalUnionTest.c b/llvm/test/Regression/CFrontend/2003-08-23-LocalUnionTest.c
index 2558f98..dc27802 100644
--- a/llvm/test/Regression/CFrontend/2003-08-23-LocalUnionTest.c
+++ b/llvm/test/Regression/CFrontend/2003-08-23-LocalUnionTest.c
@@ -1,3 +1,5 @@
+// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null
+
 
 
 union foo { int X; };