bug#43598: replace-in-string: finishing touches

[Lars Ingebrigtsen]

Mattias Engdegård <mattiase@acm.org> writes:

>> Right, so if the multibyteness differs, then do another check to see
>> whether both strings are all-ASCII anyway, and do the comparison without
>> conversion...
>
> Both strings don't need to be all-ASCII; one of them suffices.

Hm, yes, that's true...  and I guess a further micro-optimisation would
be if NEEDLE is non-ASCII and HAYSTACK is all-ASCII, then there's no
point in memmem-ing at all. 

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