vulkan: rms norm optimization using subgroup reductions (#29882)
* RMS Norm Subgroup reductions optimizaton
* Fix build error
* Improved optimization
* Make usage of BLOCK_SIZE consistent
* Add fast path to skip 2nd subgroupAdd
* Add AMD Vendor to subgroup reduction opt
* Add comment clarifying rms_dict and merge_maps behavior
* Add unroll
* Rebase
* Fixed syntax issue
* Add 128/256/512 block sizes to non-subgroup path
* Remove trailing whitespace
**Website:**
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**macOS/iOS:**
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**Linux:**
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**Android:**
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**Windows:**
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- [Windows arm64 (OpenCL Adreno)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-opencl-adreno-arm64.zip)
- [Windows x64 (CUDA 12)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-cuda-12.4-x64.zip) - [CUDA 12.4 DLLs](https://github.com/ggml-org/llama.cpp/releases/download/b11905/cudart-llama-bin-win-cuda-12.4-x64.zip)
- [Windows x64 (CUDA 13)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-cuda-13.4-x64.zip) - [CUDA 13.4 DLLs](https://github.com/ggml-org/llama.cpp/releases/download/b11905/cudart-llama-bin-win-cuda-13.4-x64.zip)
- [Windows arm64 (CUDA 13)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-cuda-13.4-arm64.zip) - [CUDA 13.4 DLLs](https://github.com/ggml-org/llama.cpp/releases/download/b11905/cudart-llama-bin-win-cuda-13.4-arm64.zip)
- [Windows x64 (Vulkan)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-vulkan-x64.zip)
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- [Windows x64 (OpenVINO)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-openvino-2026.4.1-x64.zip)
- [Windows x64 (SYCL)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-sycl-x64.zip)
- [Windows x64 (ROCm 10.0)](https://github.com/ggml-org/llama.cpp/releases/download/b11905/llama-b11905-bin-win-rocm-10.0-x64.zip)
**openEuler:**
- [DISABLED](https://github.com/ggml-org/llama.cpp/pull/23705)
- openEuler x86 (310p)
- openEuler x86 (910b, ACL Graph)
- openEuler aarch64 (310p)
- openEuler aarch64 (910b, ACL Graph)
**UI:**
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