fix allocations coming from `num_elements`

[ranocha]

Fixes https://github.com/trixi-framework/Trixi.jl/issues/1435 on Julia v1.9.0-rc3.

[codecov[bot]]

Codecov Report

Merging #120 (d1bc399) into main (fbc55b9) will not change coverage. The diff coverage is 72.72%.

@@           Coverage Diff           @@
##             main     #120   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files          25       25           
  Lines        2842     2842           
=======================================
  Hits         2734     2734           
  Misses        108      108           

Impacted Files	Coverage Δ
src/MeshData.jl	94.62% <72.72%> (ø)

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[ranocha]

I don't see what fails on Windows...

[jlchan]

@ranocha thanks for catching that! I'm rerunning the failed windows test, but otherwise LGTM.

[jlchan]

Closing in favor of https://github.com/jlchan/StartUpDG.jl/pull/121