[PATCH, i386] Update to match latest AVX512 spec.

[Ilya Tocar]

Hi,
Between [1] and [2] versions of the spec there were some changes.
In particular:
  1)prefetchwt1 instruction now has it's own CPUID
  2)vptestnmd/vptesnmq instructions now have CPUID of AVX512F not AVX512CD
Also there was version of vctps2ph with sae and only 1 register operand, which was encoded
as if missing operand was equal to ymm0. I didn't found any references to it in [2],
so I removed it.
Attached is gzipped patch. Testing passes. There are a few trailing whitespaces,
but only in auto-generated files.
Ok for trunk?

[1] http://download-software.intel.com/sites/default/files/319433-015.pdf
[2] http://download-software.intel.com/sites/default/files/managed/50/1a/319433-018.pdf
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