First stab at nongenabi

[wsmoses]

@vchuravy what are your thoughts on a design like this for supporting non-gen abi

[vchuravy]

In order for code to relocatable you may not observe world as a compile time constant. You may look at the tls_world_age, but you may not cache that or put it into a Val.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.09859% with 12 lines in your changes missing coverage. Please review.

Project coverage is 70.35%. Comparing base (d4f44d6) to head (afaacda). Report is 6 commits behind head on main.

Files	Patch %	Lines
src/Enzyme.jl	78.78%	7 Missing :warning:
src/compiler.jl	77.27%	5 Missing :warning:

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1575      +/-   ##
==========================================
- Coverage   70.42%   70.35%   -0.07%     
==========================================
  Files          30       30              
  Lines       12754    12788      +34     
==========================================
+ Hits         8982     8997      +15     
- Misses       3772     3791      +19     

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