Enable threefry_doesnt_use_long test on rangeify (#12229)

* dont bufferize rangeify

* enable doesnt_use_long test

.github/workflows/test.yml

@@ -525,7 +525,7 @@ jobs:
       # test_instancenorm_3d is very slow
       run: |
         CPU=1 CPU_LLVM=0 RANGEIFY=1 python3 -m pytest -n auto --durations 20 \
-          -k "not test_threefry_doesnt_use_long and not test_embedding and not test_load_state_dict_sharded_model_dict_same_axis and not test_instancenorm_3d" \
+          -k "not test_embedding and not test_load_state_dict_sharded_model_dict_same_axis and not test_instancenorm_3d" \
           test/test_tiny.py test/test_rangeify.py test/test_ops.py test/test_tensor_variable.py \
           test/test_outerworld_range.py test/test_sample.py test/test_randomness.py test/test_nn.py test/test_arange.py
     - name: Test const folding

tinygrad/schedule/rangeify.py

@@ -376,7 +376,8 @@ def remove_bufferize(src:UOp, buf:UOp, idx:UOp):
   # here is where we compute the cost
   # for now just no REDUCE, COPY, or ASSIGN
   ran = src.toposort(gate=lambda x: x.op not in {Ops.INDEX})
-  if any(x.op in {Ops.REDUCE, Ops.COPY, Ops.ASSIGN} for x in ran): return None
+  # we don't want to bufferize threefry, also causes problems because not all platforms support long
+  if any(x.op in {Ops.REDUCE, Ops.COPY, Ops.ASSIGN} for x in ran) and src.op is not Ops.THREEFRY: return None
 
   # simple, matching old behavior
   #if src.op is not Ops.INDEX: return None