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[CK_TILE] Blockscale Gemm Fix Multi-Arch Compilation ## Motivation This PR updates CK_TILE blockscale GEMM-quant kernels and launch helpers to compile across multiple GPU architectures by introducing compile-time availability gating and a new attribute tag mechanism for kernel symbol/attribute specialization. ## Technical Details - Add an architecture-guarded `kIsAvailable` flag to the gfx950 pipeline and propagate availability handling into `QuantGemmKernel`. - Extend `make_kernel`/`kentry` to accept an `Attr` tag enabling per-kernel compile-time attributes (e.g., `no-packed-fp32-ops`) and unique symbols. - Update the blockscale GEMM quant example to pass kernel attributes and adjust gfx950 gating. ## Test Plan - CI - Local test: `cmake .. --preset dev -DGPU_TARGETS='gfx942;gfx950' -GNinja && ninja tile_example_gemm_quant` - Local test with ROCm/aiter#1954 ## Test Result <!-- Briefly summarize test outcomes. --> ## Submission Checklist - [x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.