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[PATCH, AArch64] Add optimized strrchr

Similar to the strchr implementation, attached is an implementation of
strrchr.  Unlike the generic C version, this finds the last instance of
a string without having to repeatedly call strchr.  This gives notable
performance improvements when there is more than one instance of the
target character in the string (something the benchmarks never measure,
by the way).

OK?

R.
	sysdeps/aarch64/strrchr.S: New file.

Attachment: glibc-strrchr.patch
Description: Text document

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