Boilerplate implementing #121 native bailout - thoughts?

[twitchyliquid64]

This is the beginning of the bailout system.

[codecov-io]

Codecov Report

Merging #124 into master will increase coverage by 0.54%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #124      +/-   ##
==========================================
+ Coverage   66.01%   66.55%   +0.54%     
==========================================
  Files          41       41              
  Lines        4172     4246      +74     
==========================================
+ Hits         2754     2826      +72     
- Misses       1147     1149       +2     
  Partials      271      271

Impacted Files	Coverage Δ
exec/internal/compile/native.go	54.54% <100%> (+54.54%)	:arrow_up:
exec/internal/compile/native_exec.go	100% <100%> (ø)	:arrow_up:
exec/native_compile_nogae.go	100% <100%> (ø)	:arrow_up:
exec/native_compile.go	55.35% <42.85%> (-2.65%)	:arrow_down:
exec/internal/compile/backend_amd64.go	79.81% <84.48%> (+3.06%)	:arrow_up:

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[twitchyliquid64]

PTAL :)

[twitchyliquid64]

Note: For now I've enabled native bounds-checking only when tag debugstack is set - my intention is to expose this as a VM option as well.

Main benefit of this is having bounds checking over native stack push/pops in the CI test runs.