Support [profile.default-llvm-cov]

[def-]

Depends on taiki-e/cargo-llvm-cov#259 (edit: has been released)

This is done similarly for miri and makes sense since both increase running times.

[codecov]

Codecov Report

Merging #857 (500b9d2) into main (99a5f42) will decrease coverage by 0.01%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #857      +/-   ##
==========================================
- Coverage   77.42%   77.42%   -0.01%     
==========================================
  Files          67       67              
  Lines       13371    13373       +2     
==========================================
+ Hits        10353    10354       +1     
- Misses       3018     3019       +1     

Impacted Files	Coverage Δ
nextest-runner/src/config/config_impl.rs	93.58% <ø> (ø)
cargo-nextest/src/dispatch.rs	82.65% <50.00%> (-0.06%)	⬇️

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[sunshowers]

Thanks for the PR!

Hmm, wouldn't this need to also include the settings for llvm-cov in default-config.toml?