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In multiple ways:
- Two calls to `bits_to_string()` passed in byte lengths rather than bit
lengths, which meant only 1/8th of the `BitSlice` was printed.
- `bit_str`'s purpose is entirely mysterious. I removed it and changed
its callers to print the indices in the obvious way.
- `bits_to_string`'s inner loop was totally wrong, such that it printed
entirely bogus results.
- `bits_to_string` now also adds a '|' between words, which makes the
output easier to read, e.g.:
`[ff-ff-ff-ff-ff-ff-ff-ff|ff-ff-ff-ff-ff-ff-ff-07]`.
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Currently `Word` is `usize`, and there are various places in the code
that assume this.
This patch mostly just changes `usize` occurrences to `Word`. Most of
the changes were found as compile errors when I changed `Word` to a type
other than `usize`, but there was one non-obvious case in
librustc_mir/dataflow/mod.rs that caused bounds check failures before I
fixed it.
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These need to be inlined across crates to avoid showing up as one-instruction
functions in profiles! In the benchmark from #43578 this decreased the
translation item collection step from 30s to 23s, and looks like it also allowed
vectorization elsewhere of the operations!
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Resolves a FIXME
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