[ck_tile][fmha_bwd] Fix sink_host OOB in group mode reference runner#7272

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fix/fmha-bwd-sink-host-group-mode-oob

Commits on May 11, 2026

[ck_tile][fmha_bwd] Fix sink_host OOB in group mode reference runner
LJ-underdog
committed
[ck_tile][fmha_bwd][test] Add regression test for sink_host group-mode OOB
LJ-underdog
committed