[NVPTX] Add `-march=general` option to mirror default configuration (#85222) This PR adds `-march=generic` support for the NVPTX backend. This fulfills a TODO introduced in #79873. With this PR, users can explicitly request the "default" CUDA architecture, which makes sure that no specific architecture is specified. This PR does not address any compatibility issues between different CUDA versions. --------- Co-authored-by: Joseph Huber <huberjn@outlook.com>
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