onnxruntime

929f73e1 - Plugin EP: Fix bug that incorrectly assigned duplicate MetDef IDs to fused nodes in different GraphViews (#27666)

Plugin EP: Fix bug that incorrectly assigned duplicate MetDef IDs to fused nodes in different GraphViews (#27666) ### Description Fixes a bug where `PluginExecutionProvider::GetCapability()` incorrectly assigned duplicate MetaDef IDs to fused nodes that live in different GraphViewer instances (e.g., the then/else branches of an If node). The root cause was that `GetCapability()` created a new `ModelMetadefIdGenerator` on every invocation. Since the graph partitioner calls `GetCapability()` once per subgraph, the generator's monotonic counter reset each time, producing colliding IDs across subgraphs. This caused session creation to fail with: > Failed to add kernel for example_ep_9433721956998717990_0 example_ep example_ep: Conflicting with a registered kernel with op versions. the since version is: 1 #### Fix - Promoted `ModelMetadefIdGenerator` to an instance member of `PluginExecutionProvider` so the same generator is reused across all `GetCapability()` calls, ensuring unique MetaDef IDs. - This is also consistent with how existing provider-bridge EPs create and use a single generator instance. - **Bonus perf improvement**: No longer recomputes the entire model's hash on every call to `GetCapability()`. #### Testing Example EP changes: - Refactored `SaveConstantInitializers()` → `TrySaveConstantInitializer()` to save initializers per-node-input instead of via `graph.GetInitializers()`, which doesn't return initializers defined in parent or sibling subgraphs. - Extracted `CopiesConstantInitializers()` helper to deduplicate the condition for drop_constant_initializers. Unit testing: - Added unit test called `CompilingPluginEp_MultiSubgraphs_DuplicateMetaDefIdBug` — runs an If model with Mul nodes in both branches, verifying that both fused nodes receive unique MetaDef IDs and the session creates/runs successfully. Credit to @apwojcik for [finding the bug.](https://github.com/microsoft/onnxruntime/pull/27608)