[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Removed blocks include: superseded implementations, old test data,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/fmha/pipeline/block_fmha_pipeline_qx_ks_vs_custom_policy.hpp

@@ -692,9 +692,6 @@ struct BlockFmhaPipelineQXKSVSCustomPolicy : BlockFmhaPipelineQXCustomPolicy<QLo
         constexpr index_t LaneGroups = WarpSize / LanesPerK; // within a wave
         constexpr index_t NumIssues  = kNPerBlock / (LaneGroups * NumWarps);
         static_assert(NumIssues == kNPerBlock * kKPerBlock / (kBlockSize * KVector));
-        // constexpr index_t SingleKSize = NumIssues * NumWarps * (WarpSize * KVector + kPad);
-        // constexpr index_t SingleVSize =
-        // MakeVLdsBlockDescriptor<Problem>().get_element_space_size();
         constexpr index_t BufferSize =
             GetSingleSmemElementSpaceSize<Problem>(); //  max(SingleKSize, SingleVSize);