This feature causes nothing but problems and is frequently broken. The
only optimization it was enabling were SIMD optimizations for
transcoding. In particular, for UTF-16 transcoding. This is performed by
the [`encoding_rs`](https://github.com/hsivonen/encoding_rs) crate,
which specifically uses unstable portable SIMD APIs instead of the
stable non-portable SIMD APIs.
SIMD optimizations that apply to search have long been making use of
stable APIs, and are automatically enabled when your target supports
them. This is, IMO, the correct user experience and one that
`encoding_rs` refuses to support. I'm done dealing with it, so
transcoding will only use scalar code until the SIMD optimizations in
`encoding_rs` work on stable. (This doesn't mean that `encoding_rs` has
to change. This could also be fixed by stabilizing `std::simd`.)
Fixes#2748
The top-level listing was just getting a bit too long for my taste. So
put all of the code in one directory and shrink the large top-level mess
to a small top-level mess.
NOTE: This commit only contains renames. The subsequent commit will
actually make ripgrep build again. We do it this way with the naive hope
that this will make it easier for git history to track the renames.
Sigh.
