Reduce the iteration count in some tests.

They tends to time out or just make the test suite run for longer. They definitely times out
when running a prototype moving gc.

test/tests/iter_gc.py

@@ -6,7 +6,7 @@ class C(object):
     def f(self, i):
         return i * i
     def __getitem__(self, i):
-        if i < 1000:
+        if i < 200:
             return self.f(i)
         raise IndexError(i)
 
@@ -25,7 +25,7 @@ class C2(object):
         self.n += 1
         return self.n * 2
     def next(self):
-        if self.n < 1000:
+        if self.n < 200:
             return self.f()
 
         raise StopIteration()

test/tests/testing_helpers.py

@@ -17,7 +17,7 @@ def call_function_far_up_the_stack(fn, num_calls_left=200):
 # It's useful to call the GC at different locations in the stack in case that it's the
 # call to the GC itself that left a lingering pointer (e.g. the pointer could be the
 # __del__ attribute of an object we'd like to collect).
-def call_gc_throughout_the_stack(number_of_gc_calls, num_calls_left=100):
+def call_gc_throughout_the_stack(number_of_gc_calls, num_calls_left=30):
     if num_calls_left > 0:
         call_gc_throughout_the_stack(number_of_gc_calls, num_calls_left - 1)
         if number_of_gc_calls >= num_calls_left: