build: mov deduction for booleans

[mmcloughlin]

Updates #336

[codecov-commenter]

Codecov Report

Merging #341 (54eb2c1) into master (ef60a33) will decrease coverage by 0.39%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master     #341      +/-   ##
==========================================
- Coverage   76.00%   75.61%   -0.40%     
==========================================
  Files          65       65              
  Lines       20608    20633      +25     
==========================================
- Hits        15664    15602      -62     
- Misses       4862     4953      +91     
+ Partials       82       78       -4     

Flag	Coverage Δ
integration	11.96% <11.33%> (+0.12%)	⬆️
unittests	72.69% <0.00%> (-0.43%)	⬇️

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

Impacted Files	Coverage Δ
internal/gen/mov.go	0.00% <0.00%> (ø)
build/zmov.go	12.05% <11.33%> (+1.28%)	⬆️
examples/md5x16/md5x16.go	0.00% <0.00%> (-86.42%)	⬇️
build/zinstructions.go	67.67% <0.00%> (+0.02%)	⬆️

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