I32x4U/SConvertI16x8Low/High, I16x8U/SConvertI8x16Low/High

Add pmovsxbw/wd, pmovzxbw/wd and AVX version
Add Palignr, Pmovsxbw/wd, Pmovzxbw/wd macro.
Reconstruct ptest/vptest, Ptest using macro

Change-Id: I4a26b3bb6d5791f72e3192c914758287701e78a0
Reviewed-on: https://chromium-review.googlesource.com/1111691
Commit-Queue: Jing Bao <jing.bao@intel.com>
Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53990}