[PATCH] Fix target arch attribute for skylake

[Yulia Koval]

Hi,

This patch fixes the issue, when target(arch="haswell") function was
chosen instead of target(arch="skylake") on skylake. Ok for trunk?

gcc/
    * config/i386/i386.c: Handle "skylake" and
      "skylake-avx512".

gcc/testsuite/
    * g++.dg/ext/mv16.C: New functions.

Yulia

patch_skylake
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