pass: de-prioritize base pointer in register allocation

[mmcloughlin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #184 (94bf0fa) into master (f295bde) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #184   +/-   ##
=======================================
  Coverage   79.50%   79.50%           
=======================================
  Files          56       56           
  Lines       30919    30922    +3     
=======================================
+ Hits        24581    24584    +3     
  Misses       6192     6192           
  Partials      146      146           

Flag	Coverage Δ
integration	7.45% <100.00%> (+0.01%)	⬆️
unittests	77.67% <100.00%> (+0.07%)	⬆️

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Impacted Files	Coverage Δ
pass/reg.go	83.05% <100.00%> (+0.90%)	⬆️

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