add a profile section

[sylvestre]

To make sure the binaries we publish are the best

[codecov-commenter]

Codecov Report

Base: 31.05% // Head: 30.97% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (2e44149) compared to base (4655373).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1562      +/-   ##
==========================================
- Coverage   31.05%   30.97%   -0.09%     
==========================================
  Files          48       48              
  Lines       16568    16568              
  Branches     7919     7935      +16     
==========================================
- Hits         5146     5132      -14     
- Misses       6067     6079      +12     
- Partials     5355     5357       +2     

Impacted Files	Coverage Δ
src/util.rs	35.17% <0.00%> (-1.31%)	⬇️
src/test/utils.rs	40.40% <0.00%> (-1.02%)	⬇️
src/cache/cache.rs	39.46% <0.00%> (-0.77%)	⬇️
src/compiler/args.rs	61.70% <0.00%> (-0.54%)	⬇️
src/compiler/rust.rs	33.55% <0.00%> (-0.47%)	⬇️
src/compiler/c.rs	38.67% <0.00%> (-0.46%)	⬇️
src/lru_disk_cache/mod.rs	41.03% <0.00%> (-0.31%)	⬇️
src/compiler/compiler.rs	36.16% <0.00%> (-0.29%)	⬇️
src/config.rs	35.75% <0.00%> (-0.18%)	⬇️
src/lib.rs	10.82% <0.00%> (ø)
... and 4 more

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[drahnr]

Could you explain why we're not keeping backtraces? The performance overhead exists, but compared to cache fetches and launching other binaries, it should be rather negligible (gut feeling)?
For bug reports this provides usually viable info, iff something crashes (and we manage to collect the info).