Optimized implementation for uN::{gather,scatter}_bits #149663
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Feature gate: #![feature(uint_gather_scatter_bits)]
Tracking issue: #149069
Accepted ACP: rust-lang/libs-team#695
This was initially based on the code for
gather_bitsthat @okaneco provided in rust-lang/libs-team#695 (comment) . I wanted to understand how it worked, and later on noticed some opportunities for improvement, which eventually led to this PR.