[rocm-libraries] ROCm/rocm-libraries#6302 (commit 8d419e8)

CK: Remove 41 commented-out dead code blocks (~200 lines)
 (#6302)
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Depends on #6300

## Summary

Remove 41 commented-out code blocks across 33 files in Composable
Kernel, totaling ~200 lines.

Identified using an automated dead code scanning skill (`ck-dead-code`)
with a calibrated two-stage pipeline:
1. **Pre-filter**: Keyword-based scan found 1,338 `//`-commented blocks.
Calibrated heuristics (trained on 50-sample expert classification)
reduced to 89 high-confidence candidates — 93% noise reduction.
2. **Expert triage**: LLM expert classified each block in context as
CODE_REMOVE, CODE_KEEP, or NOT_CODE.

| Classification | Count |
|---------------|-------|
| Removed (this PR) | 41 |
| Kept (debug helpers, alt configs, reference impls) | 32 |
| Not code (false positives) | 16 |

Removed blocks include: superseded implementations, old test data,
abandoned stubs, unreachable code, and buggy dead code.

include/ck_tile/ops/reduce/block/block_reduce2d.hpp

@@ -140,28 +140,6 @@ struct BlockReduce2d
                                            ReducePacksPerXDim{});
     }
 
-#if 0
-        constexpr auto I0 = number<0>{};
-        constexpr auto I1 = number<1>{};
-        constexpr auto spans = XDistributedTensor_::get_distributed_spans();
-
-        // FIXME: hard coded to reduce 2nd axis
-        sweep_tile_span(spans[I0], [&](auto dstr_idx_i0) {
-            constexpr auto y_dstr_idx = make_tuple(dstr_idx_i0);
-
-            auto y = y_tensor[y_dstr_idx];
-
-            sweep_tile_span(spans[I1], [&](auto dstr_idx_i1) {
-                constexpr auto in_dstr_idx = make_tuple(dstr_idx_i0, dstr_idx_i1);
-                const auto x = ck_tile::type_convert<ComputeDataType>(x_tensor[in_dstr_idx]);
-
-                y = reduce_func(y, x);
-            });
-
-            y_tensor(y_dstr_idx) = y;
-        });
-#endif
-
     template <typename XDistributedTensor_>
     CK_TILE_DEVICE static auto MakeYBlockTile()
     {
@@ -240,10 +218,6 @@ struct BlockReduce2dSync
 
         constexpr index_t idim_p_lane = NDimP - 1;
 
-        // const auto ps_idx = make_array<index_t>(get_warp_id(), get_lane_id());
-        // const auto rs_idx =
-        //     y_tensor.get_tile_distribution().calculate_rs_index_from_ps_index(ps_idx);
-
         constexpr index_t thread_buf_size = YDistributedTensor_::get_thread_buffer_size();
 
         // loop over thread data