3/4 - Implement native compilation - Implement amd64 backend.

[twitchyliquid64]

Please review/merge the earlier PRs in this series first - this builds on that.

This PR implements the memory allocator & a very basic amd64 backend.

[codecov-io]

Codecov Report

Merging #113 into master will decrease coverage by 3.18%. The diff coverage is 77.48%.

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
- Coverage   67.76%   64.58%   -3.19%     
==========================================
  Files          34       40       +6     
  Lines        3425     3871     +446     
==========================================
+ Hits         2321     2500     +179     
- Misses        844     1109     +265     
- Partials      260      262       +2

Impacted Files	Coverage Δ
exec/internal/compile/native.go	0% <0%> (ø)
exec/internal/compile/scanner.go	0% <0%> (ø)
exec/internal/compile/native_exec.go	100% <100%> (ø)
exec/internal/compile/backend_amd64.go	79.5% <79.5%> (ø)
exec/internal/compile/allocator.go	81.81% <81.81%> (ø)
exec/internal/compile/compile.go	0% <0%> (ø)
... and 1 more

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[twitchyliquid64]

:grin: :tada: