VG_(malloc/calloc/strdup) never return NULL (and never will).
So it's pointless to test or assert their return values.
Remove code doing so.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14528 a5019735-40e9-0310-863c-91ae7b9d1cf9
configure.ac: Generalize gcc / clang version check

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14529 a5019735-40e9-0310-863c-91ae7b9d1cf9
configure.ac: Generalize glibc version check

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14530 a5019735-40e9-0310-863c-91ae7b9d1cf9