Improve/fix hash table collision statistics + remove useless space in gdbsrv hostvisibility keywork


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14053 a5019735-40e9-0310-863c-91ae7b9d1cf9
Enable/enhance test cases for: dup_{d_d[], s_s[], h_h[], b_b[]}, ext


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14054 a5019735-40e9-0310-863c-91ae7b9d1cf9