add another test for the undef patch just for to have peace of mind :)
this follows from C99 6.7.8p10: if it is a union, the first named member is initialized
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@101539 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/designated-initializers.c b/test/CodeGen/designated-initializers.c
index 1ad5e6c..49f57ad 100644
--- a/test/CodeGen/designated-initializers.c
+++ b/test/CodeGen/designated-initializers.c
@@ -11,6 +11,9 @@
// CHECK: @u2 = global %0 { i32 0, [4 x i8] undef }
union { int i; double f; } u2 = { };
+// CHECK: @u3 = global %1 zeroinitializer
+union { double f; int i; } u3 = { };
+
// CHECK: @b = global [2 x i32] [i32 0, i32 22]
int b[2] = {
[1] = 22