Made test for compiler atomic builtins more strict, such that drd/tests/atomic_var.c doesn't trigger bug http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34115 in a.o. gcc 4.3.1 when Valgrind is configured with --enable-only32bit.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@8631 a5019735-40e9-0310-863c-91ae7b9d1cf9
1 file changed