Fix tests broken by CF

tests/compile/ass2longlong.pyx

@@ -3,7 +3,7 @@
 cdef void spam():
     cdef long long L
     cdef unsigned long long U
-    cdef object x
+    cdef object x = object()
     L = x
     x = L
     U = x

tests/compile/builtinfuncs.pyx

 # mode: compile
 
 cdef int f() except -1:
-    cdef object x, y, z, w
+    cdef object x, y = 0, z = 0, w = 0
     cdef int i
     x = abs(y)
     delattr(x, 'spam')

tests/compile/extcmethcall.pyx

@@ -14,7 +14,7 @@ cdef class SuperSpam(Spam):
 
 cdef void tomato():
     cdef Spam spam
-    cdef SuperSpam superspam
+    cdef SuperSpam superspam = SuperSpam()
     spam = superspam
     spam.add_tons(42)
     superspam.add_tons(1764)

tests/compile/extcoerce.pyx

@@ -10,8 +10,8 @@ cdef class Swallow:
 
 def f(Grail g):
     cdef int i = 0
-    cdef Swallow s
-    cdef object x
+    cdef Swallow s = Swallow()
+    cdef object x = Grail()
     g = x
     x = g
     g = i

tests/errors/e_extweakref.pyx

@@ -10,7 +10,7 @@ cdef class E:
 	cdef readonly object __weakref__
 
 cdef void f():
-	cdef C c
+	cdef C c = C()
 	cdef object x
 	x = c.__weakref__
 	c.__weakref__ = x

tests/errors/nogil.pyx

@@ -18,7 +18,7 @@ cdef void r() nogil:
     q()
 
 cdef object m():
-    cdef object x, y, obj
+    cdef object x, y = 0, obj
     cdef int i, j, k
     global fred
     q()