Lower revert argument

[sbillig]

What was wrong?

The revert arg expr wasn't being lowered, leading to a panic for certain code (eg code that uses a const)

How was it fixed?

🪄

To-Do

• OPTIONAL: Update Spec if applicable

• Add entry to the release notes (may forgo for trivial changes)

• Clean up commit history

[codecov-commenter]

Codecov Report

Merging #619 (d18b0f1) into master (17950f2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head d18b0f1 differs from pull request most recent head 0169d80. Consider uploading reports for the commit 0169d80 to get more accurate results

@@           Coverage Diff           @@
##           master     #619   +/-   ##
=======================================
  Coverage   86.51%   86.52%           
=======================================
  Files          96       96           
  Lines        8419     8420    +1     
=======================================
+ Hits         7284     7285    +1     
  Misses       1135     1135           

Impacted Files	Coverage Δ
crates/lowering/src/mappers/functions.rs	99.39% <100.00%> (+<0.01%)	⬆️

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