drd: Add post-rwlock_init and pre-rwlock_destroy client requests (#332265)

From: Ivo Raisr <ivosh@ivosh.net>


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13882 a5019735-40e9-0310-863c-91ae7b9d1cf9
3 files changed