check_vmflag_guard
ASSERT_FALSE(check_vmflag_guard(ptr));
ASSERT_TRUE(check_vmflag_guard(ptr));
ASSERT_TRUE(check_vmflag_guard(ptr));
ASSERT_TRUE(check_vmflag_guard(ptr));
ASSERT_TRUE(check_vmflag_guard(ptr));
ASSERT_TRUE(check_vmflag_guard(&ptr[5 * page_size]));
ASSERT_TRUE(check_vmflag_guard(ptr));
bool check_vmflag_guard(void *addr);