Fix testing case for Release build (r171493)

rdar://11562117


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171564 91177308-0d34-0410-b5e6-96231b3b80d8
In my last patch initialize the destination to null (with a simple store) before doing a storeStrong to it.
// rdar://12530881


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171572 91177308-0d34-0410-b5e6-96231b3b80d8