Add testcase for accumulating in fp32, but storing as bf16 (triton-la…

…ng#1305)

No further changes were needed after triton-lang#1282. Fixes triton-lang#1264.

Signed-off-by: Julian Oppermann <julian.oppermann@codeplay.com>

python/tutorials/09-experimental-block-pointer.py

@@ -218,6 +218,7 @@ def matmul(a, b, accum_dtype, res_dtype):
                                       (torch.float16, torch.float32, torch.float16),
                                       (torch.float16, torch.float32, torch.float32),
                                       (torch.bfloat16, torch.float32, torch.float32),
+                                      (torch.bfloat16, torch.float32, torch.bfloat16),
                                       (torch.float32, torch.float32, torch.float32),
                                       (torch.int8, torch.int32, torch.int32)]:
     if dtype.is_floating_point: