all: VPCLMULQDQ instruction

[mmcloughlin]

Imported from #349

[codecov-commenter]

Codecov Report

Merging #360 (57fb033) into master (b893b32) will not change coverage.
The diff coverage is 80.00%.

@@           Coverage Diff           @@
##           master     #360   +/-   ##
=======================================
  Coverage   76.00%   76.00%           
=======================================
  Files          65       65           
  Lines       20790    20790           
=======================================
  Hits        15801    15801           
  Misses       4906     4906           
  Partials       83       83           

Flag	Coverage Δ
integration	11.87% <0.00%> (ø)
unittests	73.10% <80.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
x86/zoptab.go	92.42% <ø> (ø)
build/zinstructions.go	67.64% <66.66%> (ø)
x86/zctors.go	100.00% <100.00%> (ø)

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