memcheck: Optimize the memcpy() intercept

This change reduces the time needed to run the memcheck regression tests
with 2% on my development system.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13716 a5019735-40e9-0310-863c-91ae7b9d1cf9
memcheck/mc_replace_strmem.c: Remove trailing whitespace

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13717 a5019735-40e9-0310-863c-91ae7b9d1cf9