Fix cuda compilation

[EmilyBourne]

Merge Request - GuideLine Checklist

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[EmilyBourne]

@julianlitz This PR fixes the cuda compilation in #256 but it doesn't change the logic. The tests are already failing in #256

[julianlitz]

@EmilyBourne Alright I will fix that

[julianlitz]

Oh you already added these fence() calls... 🫠

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (litz_020@2e1d720). Learn more about missing BASE report.

Additional details and impacted files

@@             Coverage Diff             @@
##             litz_020     #257   +/-   ##
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  Coverage            ?   90.20%           
===========================================
  Files               ?       79           
  Lines               ?     8934           
  Branches            ?        0           
===========================================
  Hits                ?     8059           
  Misses              ?      875           
  Partials            ?        0           

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[julianlitz]

@EmilyBourne Done