move BitPacked slice from kernel -> parent reduce #7195

Performance Regression: -15.51%

❌ 2 regressed benchmarks
✅ 1104 untouched benchmarks
⏩ 1522 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

	Mode	Benchmark	`BASE`	`HEAD`	Efficiency
❌	Simulation	`bitwise_not_vortex_buffer_mut[1024]`	477.2 ns	535.6 ns	-10.89%
❌	Simulation	`bitwise_not_vortex_buffer_mut[128]`	317.8 ns	376.1 ns	-15.51%

_{Comparing aduffy/slicey-boi (ba53919) with develop (1f3206f)}

1522 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩