[PATCH][x86] Support clwb,pcommit,ifma,vbmi.

[Ilya Tocar]

Hi,

Recent release of Intel ISA reference [1] has 4 new ISA extensions:
CLWB,PCOMMIT,AVX512IFMA,AVX512VBMI.
Attached patch adds support for them.
Ok for trunk?

1:https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
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