b10699

ggml : add ggml_backend_op_alloc_size_may_expand, use it in RPC (#27960)

some backends (Metal, SYCL, WebGPU) require additional memory for
fleeting data for certain ops, which is reflected in their
get_alloc_size implementations.

add ggml_backend_op_alloc_size_may_expand() to the backend utils,
listing these ops, and assert in ggml_backend_buft_get_alloc_size
that a backend expanding the alloc size of a compute op only does so
for ops listed in the helper.

use the helper in the RPC backend to decide whether to query the
remote server for the actual alloc size, instead of a hardcoded list.

Assisted-by: pi:llama.cpp/Qwen3.8-27B

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/43988177

macOS/iOS:

• macOS Apple Silicon (arm64)
• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
• macOS Intel (x64)
• iOS XCFramework

Linux:

• Ubuntu x64 (CPU)
• Ubuntu arm64 (CPU)
• Ubuntu s390x (CPU)
• Ubuntu x64 (Vulkan)
• Ubuntu arm64 (Vulkan)
• Ubuntu x64 (ROCm 7.14)
• Ubuntu x64 (OpenVINO)
• Ubuntu x64 (SYCL FP32)
• Ubuntu x64 (SYCL FP16)

Android:

• Android arm64 (CPU)

Windows:

• Windows x64 (CPU)
• Windows arm64 (CPU)
• Windows arm64 (OpenCL Adreno)
• Windows x64 (CUDA 12) - CUDA 12.4 DLLs
• Windows x64 (CUDA 13) - CUDA 13.3 DLLs
• Windows arm64 (CUDA 13) (preview) - CUDA 13.4 DLLs
• Windows x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (ROCm 7.14)

openEuler:

• DISABLED
• openEuler x86 (310p)
• openEuler x86 (910b, ACL Graph)
• openEuler aarch64 (310p)
• openEuler aarch64 (910b, ACL Graph)

• UI