Crash in SLP for vector data type as function argument.

committed in r225517. Thanks.

Sender : Arnold Schwaighofer<aschwaighofer@apple.com>
Title : Re: Re: [LLVMdev] Crash in SLP for vector data type as function argument.

I am fine with this going in without a test case. This code is currently not enabled. Just mention in the commit message that the assumption that "VectorizedValue" is always an instruction is not correct because we could get a vectorized tree consisting of just a Constant or an Argument vector.

Thanks