test: xfail bench/task-perf-one-million. OOM on 32-bit linux w/o opts

Author: brson

src/test/bench/task-perf-one-million.rs

@@ -10,6 +10,8 @@
 
 // Test for concurrent tasks
 
+// xfail-test OOM on linux-32 without opts
+
 use std::comm::*;
 use std::os;
 use std::task;