perf[gpu]: fls gen refactor

[joseph-isaacs]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 81 lines in your changes missing coverage. Please review.
✅ Project coverage is 87.47%. Comparing base (bfd311a) to head (12944ff).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
fls-gpu-kernel-gen/src/bit_unpack.rs	0.00%	81 Missing ⚠️

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