[PATCH] Improve performance of strcat

[Wilco Dijkstra]

Hi,

This patch improves strcat performance by using strlen and strcpy. Strlen has a fast C
implementation, so this improves performance even on targets which don't have an optimized strlen
and strcpy - it is 25% faster in bench-strcat. On targets which don't provide an optimized strcat
but which do have an optimized strlen and strcpy, performance gain is > 2x.

OK for commit?

ChangeLog:
2014-08-07  Wilco Dijkstra <wdijkstr@arm.com>

	* string/strcat.c (strcat): Improve performance by using strlen/strcpy.
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