Set codegen kwargs based on toplevel setting (NFC)

[maleadt]

This simplifies the kwarg values used in compile/codegen, and should make a little more clear what's happening and when.

It breaks the precompile.jl, but with the recent work by @vchuravy I take it we better move to an actual precompilation workload anyway?

[vchuravy]

I take it we better move to an actual precompilation workload anyway?

For GPUCompiler it doesn't matter as much, but yeah we can switch to PrecompileTools.jl

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 2 lines in your changes missing coverage. Please review.

Project coverage is 65.77%. Comparing base (7143d02) to head (fdede07).

Files	Patch %	Lines
src/driver.jl	83.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #600      +/-   ##
==========================================
- Coverage   66.32%   65.77%   -0.56%     
==========================================
  Files          24       24              
  Lines        3353     3348       -5     
==========================================
- Hits         2224     2202      -22     
- Misses       1129     1146      +17     

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