b3466af85d
This is a reland of commit 49599d8641
Original change's description:
> Move code from base::ByteSwap to base::numerics and fix UB casts
>
> While moving ByteSwap() callers, I found the DTS code doing byte swaps
> by casting byte spans to uint16_t spans, which causes UB if they are
> not aligned. The function explicitly handles non-16-bit aligned inputs
> earlier, so clearly it's expected and we should not CHECK on the
> alignment. So instead, change the code to work with bytes and do the
> swaps in a for loop.
>
> While here, make use of the new split_at() to split the output span
> up into disjoint subspans that are each written to.
>
> R=dalecurtis@chromium.org
>
> Bug: 40284755
> Change-Id: I11c557fd3e0f6fd64555b299f3492ca7722aeae2
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5366084
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Owners-Override: danakj <danakj@chromium.org>
> Commit-Queue: danakj <danakj@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1271821}
Bug: 40284755
Change-Id: I6a067c0bee14898006163a5706bff5e9947843f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5366281
Owners-Override: danakj <danakj@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1272244}