preserve the backtrace in case of crashes

[sylvestre]

See: https://github.com/mozilla/sccache/pull/1562/files#r1071828668

[codecov-commenter]

Codecov Report

Base: 31.04% // Head: 31.05% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (a0b09d1) compared to base (c38b6ba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1573      +/-   ##
==========================================
+ Coverage   31.04%   31.05%   +0.01%     
==========================================
  Files          48       48              
  Lines       16568    16568              
  Branches     7927     7923       -4     
==========================================
+ Hits         5144     5146       +2     
+ Misses       6070     6069       -1     
+ Partials     5354     5353       -1     

Impacted Files	Coverage Δ
src/jobserver.rs	47.91% <0.00%> (-2.09%)	⬇️
src/test/utils.rs	36.36% <0.00%> (-2.03%)	⬇️
src/cache/cache.rs	39.46% <0.00%> (-0.39%)	⬇️
src/compiler/compiler.rs	35.95% <0.00%> (-0.36%)	⬇️
src/compiler/gcc.rs	55.52% <0.00%> (-0.31%)	⬇️
src/server.rs	32.46% <0.00%> (-0.11%)	⬇️
src/compiler/c.rs	39.35% <0.00%> (ø)
src/compiler/rust.rs	34.07% <0.00%> (ø)
src/lib.rs	10.82% <0.00%> (+0.05%)	⬆️
src/compiler/msvc.rs	43.48% <0.00%> (+0.13%)	⬆️
... and 5 more

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