memory: don't segfault when running out of memory allocating a small object
memory: don't segfault when running out of memory allocating a small object

While recovery is likely to fail, it's still nicer to throw an exception.

flashbuckets/seastar,tempbottle/seastar,scylladb/scylla-seastar,dwdm/seastar,xtao/seastar,joerg84/seastar,bowlofstew/seastar,chunshengster/seastar,avikivity/seastar,anzihenry/seastar,chunshengster/seastar,wildinto/seastar,dreamsxin/seastar,jonathanleang/seastar,norcimo5/seastar,wildinto/seastar,hongliangzhao/seastar,shyamalschandra/seastar,kjniemi/seastar,stamhe/seastar,avikivity/seastar,kjniemi/seastar,joerg84/seastar,sjperkins/seastar,norcimo5/seastar,koolhazz/seastar,scylladb/seastar,sjperkins/seastar,dwdm/seastar,printedheart/seastar,xtao/seastar,scylladb/scylla-seastar,acbellini/seastar,hongliangzhao/seastar,shyamalschandra/seastar,kjniemi/seastar,chunshengster/seastar,linearregression/seastar,anzihenry/seastar,dwdm/seastar,anzihenry/seastar,flashbuckets/seastar,dreamsxin/seastar,linearregression/seastar,mixja/seastar,tempbottle/seastar,leejir/seastar,cloudius-systems/seastar,flashbuckets/seastar,linearregression/seastar,syuu1228/seastar,koolhazz/seastar,bowlofstew/seastar,acbellini/seastar,shyamalschandra/seastar,xtao/seastar,tempbottle/seastar,mixja/seastar,stamhe/seastar,scylladb/seastar,stamhe/seastar,jonathanleang/seastar,avikivity/seastar,leejir/seastar,printedheart/seastar,printedheart/seastar,dreamsxin/seastar,scylladb/scylla-seastar,norcimo5/seastar,wildinto/seastar,cloudius-systems/seastar,bowlofstew/seastar,leejir/seastar,acbellini/seastar,hongliangzhao/seastar,jonathanleang/seastar,koolhazz/seastar,cloudius-systems/seastar,mixja/seastar,sjperkins/seastar,syuu1228/seastar,scylladb/seastar,joerg84/seastar,syuu1228/seastar