test_embedding: Remove broken tests returning arrays from kernels

This is a use-after-free issue (by the time __modinit sends back
the return value, the array allocated on the stack of the interior
function is already dead) allowed only by mistake, presumably due
to GitHub issue m-labs#1497 or a similar bug.

artiq/test/coredevice/test_embedding.py

@@ -243,19 +243,7 @@ def args1kwargs2(self):
 
     @kernel
     def numpy_things(self):
-        return (numpy.int32(10), numpy.int64(20), numpy.array([42,]))
-
-    @kernel
-    def numpy_full(self):
-        return numpy.full(10, 20)
-
-    @kernel
-    def numpy_full_matrix(self):
-        return numpy.full((3, 2), 13)
-
-    @kernel
-    def numpy_nan(self):
-        return numpy.full(10, numpy.nan)
+        return (numpy.int32(10), numpy.int64(20))
 
     @kernel
     def builtin(self):
@@ -284,10 +272,7 @@ def test_args(self):
         self.assertEqual(exp.kwargs2(), 2)
         self.assertEqual(exp.args1kwargs2(), 2)
         self.assertEqual(exp.numpy_things(),
-                         (numpy.int32(10), numpy.int64(20), numpy.array([42,])))
-        self.assertTrue((exp.numpy_full() == numpy.full(10, 20)).all())
-        self.assertTrue((exp.numpy_full_matrix() == numpy.full((3, 2), 13)).all())
-        self.assertTrue(numpy.isnan(exp.numpy_nan()).all())
+                         (numpy.int32(10), numpy.int64(20)))
         exp.builtin()
         exp.async_in_try()