b12257

CUDA: move graph and concurrent stream state out of common.cuh (#32001)

ggml_cuda_graph, ggml_cuda_concurrent_event and ggml_cuda_stream_context
are only used by ggml-cuda.cu, but keeping them in common.cuh meant any
change to them rebuilt every CUDA translation unit. Move them to graph.cuh
and leave forward declarations in common.cuh. The context constructor,
cuda_graph() and any_cuda_graph_*() are now defined in ggml-cuda.cu, and
the stream context is held through a unique_ptr.

Also define ggml_cuda_kernel_can_use_pdl once in ggml-cuda.cu instead of
as a static function in the header, so there is one PDL cache instead of
one per translation unit, and fold the GGML_CUDA_PDL env check into it.

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/66017795

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