tests/micropython/viper_cond: Add test for large int as bool.

tests/micropython/viper_cond.py

@@ -23,3 +23,11 @@ def g():
     if y:
         print("y", y)
 g()
+
+# using an int as a conditional that has the lower 16-bits clear
+@micropython.viper
+def h():
+    z = 0x10000
+    if z:
+        print("z", z)
+h()

tests/micropython/viper_cond.py.exp

@@ -1,3 +1,4 @@
 not x False
 x True
 y 1
+z 65536