[Bug target/62128] Use vpalignr for AVX2 rotation

[evstupac at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62128

Stupachenko Evgeny <evstupac at gmail dot com> changed:

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                 CC|                            |evstupac at gmail dot com

--- Comment #1 from Stupachenko Evgeny <evstupac at gmail dot com> ---
Confirm.
A part of the patch fixing this discussed at:
https://gcc.gnu.org/ml/gcc-patches/2014-08/msg01434.html
The other part is generation of corresponding pattern for rotation. I'll create
corresponding patch.