Allow more ui tests for SGX

src/test/ui/issues/issue-59020.rs

@@ -1,7 +1,6 @@
 // edition:2018
 // run-pass
 // ignore-emscripten no threads support
-// ignore-sgx no thread sleep support
 
 use std::thread;
 use std::time::Duration;

src/test/ui/issues/issue-9396.rs

@@ -2,7 +2,6 @@
 #![allow(unused_must_use)]
 #![allow(deprecated)]
 // ignore-emscripten no threads support
-// ignore-sgx no thread sleep support
 
 use std::sync::mpsc::{TryRecvError, channel};
 use std::thread;

src/test/ui/mpsc_stress.rs

@@ -1,7 +1,6 @@
 // run-pass
 // compile-flags:--test
 // ignore-emscripten
-// ignore-sgx no thread sleep support
 
 use std::sync::mpsc::channel;
 use std::sync::mpsc::TryRecvError;
@@ -37,6 +36,7 @@ impl Barrier {
     fn wait(self) {
         self.shared.fetch_add(1, Ordering::SeqCst);
         while self.shared.load(Ordering::SeqCst) != self.count {
+            thread::yield_now();
         }
     }
 }

src/test/ui/sleep.rs

@@ -1,6 +1,5 @@
 // run-pass
 // ignore-emscripten no threads support
-// ignore-sgx no thread sleep support
 
 use std::thread::{self, sleep};
 use std::time::Duration;

src/test/ui/tcp-stress.rs

@@ -4,7 +4,6 @@
 // ignore-emscripten no threads or sockets support
 // ignore-netbsd system ulimit (Too many open files)
 // ignore-openbsd system ulimit (Too many open files)
-// ignore-sgx no thread sleep support
 
 use std::io::prelude::*;
 use std::net::{TcpListener, TcpStream};