[llvm] r216678 - Do not introduce new shuffle patterns after operation legalization if SHUFFLE_VECTOR

[Chandler Carruth]

On Thu, Aug 28, 2014 at 10:49 AM, Owen Anderson <resistor at mac.com> wrote:

> Do not introduce new shuffle patterns after operation legalization if
> SHUFFLE_VECTOR
> was marked custom.  The target independent DAG combine has no way to know
> if
> the shuffles it is introducing are ones that the target could support or
> not.
>

Test case? This seems somewhat arbitrary otherwise...
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