Reduce a tiny bit of overhead in a very long running test.

tests/run/trashcan.pyx

@@ -33,7 +33,7 @@ cdef class Recurse:
     cdef public attr
     cdef int deallocated
 
-    def __init__(self, x):
+    def __cinit__(self, x):
         self.attr = x
 
     def __dealloc__(self):
@@ -68,7 +68,7 @@ cdef class RecurseFreelist:
     cdef public attr
     cdef int deallocated
 
-    def __init__(self, x):
+    def __cinit__(self, x):
         self.attr = x
 
     def __dealloc__(self):
@@ -118,7 +118,7 @@ cdef class Sub1(Base):
     """
     cdef public attr
 
-    def __init__(self, x):
+    def __cinit__(self, x):
         self.attr = x
 
     def __dealloc__(self):
@@ -140,7 +140,7 @@ cdef class Sub2(Middle):
     """
     cdef public attr
 
-    def __init__(self, x):
+    def __cinit__(self, x):
         self.attr = x
 
     def __dealloc__(self):