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

[Mattias Engdegård]

27 sep. 2020 kl. 02.03 skrev Lars Ingebrigtsen <larsi@gnus.org>:

> *phew*

Not bad! This seems to work all right.
Here are some minor optimisations:

- Do the fast all-ASCII test (bytes == chars) before iterating through the 
bytes to check for non-ASCII chars.
- Faster check for non-ASCII non-raw bytes (no need for the complex code in 
string_char_advance).

It is tempting to vectorise the all-ASCII loop. Maybe another day...

The patch also adds some more test cases for completeness.

string-search-tweaks.diff
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