[llvm] r251207 - [X86][SSE] lowerVectorShuffleWithUNPCK - use equivalent shuffle mask test.

[Simon Pilgrim via llvm-commits]

> On 26 Oct 2015, at 23:08, Chandler Carruth <chandlerc at google.com> wrote:
> 
> On Sat, Oct 24, 2015 at 1:50 PM Simon Pilgrim via llvm-commits <llvm-commits at lists.llvm.org <mailto:llvm-commits at lists.llvm.org>> wrote:
> Author: rksimon
> Date: Sat Oct 24 15:48:08 2015
> New Revision: 251207
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=251207&view=rev <http://llvm.org/viewvc/llvm-project?rev=251207&view=rev>
> Log:
> [X86][SSE] lowerVectorShuffleWithUNPCK - use equivalent shuffle mask test.
> 
> Use isShuffleEquivalent to match UNPCK shuffles - better support for build vector inputs.
> 
> Why was there no test case exercising this?

My mistake; this was originally part of the r251211, where the tests did get updated, but I split it at the last minute as I didn’t like the way I was changing the called function and the calling functions at once. I’ll add some avx512 shuffles tests that make use of this.
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