Migrate 2009-09-09-packed-layout.cpp test from llvm/test/FrontendC++.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@138090 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/2009-09-09-packed-layout.cpp

@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -emit-llvm -triple i386-apple-darwin11 %s -o /dev/null
+class X {
+ public:
+  virtual ~X();
+  short y;
+};
+#pragma pack(push, 1)
+class Z : public X {
+ public: enum { foo = ('x') };
+ virtual int y() const;
+};
+#pragma pack(pop)
+class Y : public X {
+public: enum { foo = ('y'), bar = 0 };
+};
+X x;
+Y y;
+Z z;