[Vulkan] Honor downcast_64_bit=False in the partitioner - #23209
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With downcast_64_bit disabled, the graph builder refuses int64 and float64 tensors, but the partitioner still claimed those nodes, so lowering failed late or the delegate aborted at load. The partitioner now rejects nodes that need 64-bit dtypes in that mode, and keeps a fusable pattern entirely on CPU when it touches a 64-bit non-constant tensor rather than splitting it. Constant parameters are exempt because quantization parameters are folded away during fusion. Authored with OpenAI Codex; split planned with Claude Code.
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/23209
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Superseded by #23248, part 9/15 of the ghstack replacement series. The current integration PR is #23254. This PR is closed in favor of the replacement; its previous description and review history are retained.
With downcast_64_bit disabled, the graph builder refuses int64 and float64 tensors, but the partitioner still claimed those nodes, so lowering failed late or the delegate aborted at load. The partitioner now rejects nodes that need 64-bit dtypes in that mode, and keeps a fusable pattern entirely on CPU when it touches a 64-bit non-constant tensor rather than splitting it. Constant parameters are exempt because quantization parameters are folded away during fusion.
Part 9/15 of the Vulkan transformer and operator-conformance stack. Depends on #23208; review against the selected base branch. Integration PR: #23162.
Validation: 4 passed, 2 warnings in 32.37s. Lintrunner and git diff --check pass. Native tests use MoltenVK with portable CPU kernels; hardware and SwiftShader CI are pending.
Authored with OpenAI Codex; split planned with Claude Code.
cc @SS-JIA @manuelcandales @digantdesai @cbilgin