Replace the "compiler" resource with the more generic "cpu", so
as to mark CPU-heavy tests.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index dfddfb5..8784e34 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -837,6 +837,7 @@
         self.assertEquals(b"abcdefg", bufio.read())
 
     @unittest.skipUnless(threading, 'Threading required for this test.')
+    @support.requires_resource('cpu')
     def test_threads(self):
         try:
             # Write out many bytes with exactly the same number of 0's,
@@ -1105,6 +1106,7 @@
             self.assertEqual(f.read(), b"abc")
 
     @unittest.skipUnless(threading, 'Threading required for this test.')
+    @support.requires_resource('cpu')
     def test_threads(self):
         try:
             # Write out many bytes from many threads and test they were