ciflow/trunk/198519: [FX] Skip fusion discovery for fully supported graphs (#198519)
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Summary: When every callable node is accelerator-supported, the splitter cannot create an accelerator/CPU boundary. Skip FxNetAccFusionsFinder in that case while preserving normal dependency construction and update_deps_for_fusions behavior. This avoids quadratic fusion bookkeeping on large fully supported graphs. Test Plan: buck2 run mode/opt //caffe2/test:fx -- -r all_supported_nodes_skip_fusion_dependency_analysi…
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