Returning argument string (regexp-quote)

[Mattias Engdegård]

In most calls to 'regexp-quote', the argument doesn't actually need converting. 
It would be nice to avoid the allocation in that case. Patch.

More generally, do we need to preserve allocation for functions not 
specifically documented to return new strings? I can imagine there being code 
that depend on it by accident, but string mutation is rare.

0001-Allow-regexp-quote-to-return-its-argument.patch
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