Put back the flags field in the constant CF string type.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44222 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/cfstring.c b/test/CodeGen/cfstring.c
new file mode 100644
index 0000000..c7df1b3
--- /dev/null
+++ b/test/CodeGen/cfstring.c
@@ -0,0 +1,6 @@
+// RUN: clang -emit-llvm %s
+#define CFSTR __builtin___CFStringMakeConstantString
+
+void f() {
+  CFSTR("Hello, World!");
+}
\ No newline at end of file