optimise Perl_sv_gets(): use memchr() for loop

The inner loop which searches for the next separator character and copies
buffer bytes: replace with memchr() and Copy().  These functions are
likely to be optimised to use whatever hardware facilities are available.

(But first check that the first char in the buffer isn't the separator:
blank lines are quite common, and we can skip the overhead of calling
memchr() in that case).

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