WIP improve frule inference

[aviatesk]

Supposed to work with https://github.com/JuliaLang/julia/tree/avi/bestguess-overload.

[codecov[bot]]

Codecov Report

Patch coverage: 69.23% and project coverage change: -0.06% :warning:

Comparison is base (9b2a506) 55.01% compared to head (2438a47) 54.96%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
- Coverage   55.01%   54.96%   -0.06%     
==========================================
  Files          28       28              
  Lines        2790     2800      +10     
==========================================
+ Hits         1535     1539       +4     
- Misses       1255     1261       +6     

Files Changed	Coverage Δ
src/stage2/interpreter.jl	22.17% <69.23%> (+1.79%)	:arrow_up:

... and 1 file with indirect coverage changes

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