daisytuner / docc / 28806128926

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New LibNodeExpansion pass (#740)

* Switched expansion "pipeline" to new LibNodeExpansionPass that can recursively expand using a LibNodeExpander impl.
- removed access to analysis_manager from expansion methods, as those would currently not be appropriately maintained between nodes
+ New expansion API handles more of the boilerplate code (checking for standalone, creating boundary access nodes, removing old elements)
* Also migrated sdfg-json-to-c.cpp to not using the expansion pipeline anymore
* toStr() for ReduceNodes and giving PyStructuredSDFG access to the output_dir for additional dumping
~ DotVisualizer : Fix on nested sequences.
+ DotVisualizer: visualize empty sequences
* DotVisualizer default-enabled show block/loop ids
 * while MathNodes still have an expand-method, the new infrastructure is based upon "Expander" classes. The MathNodeExpander just redirects to the method for now
 ~ Broadcast node still used old ptr-output semantics
 * updated tensor & blas node expand to new expand API, that handles more of the boilerplate code (checking, removing old nodes, creating standalone-replacement nodes)
 - removed Transpose Node. Was unused and on old ptr-semantics
 + StructuredSDFGBuilder.add_sequence_at, add_for_at, add_map_at
 * switched StructuredSDFGBuilder internally to use ptr of Assignments to express using default assignments when needed
 * updated tests to use the new expand_single_math_node helper function, instead of the method directly
 + pass and expand-single helper functions are ready to use other expanders
 + EinsumExpansionPass is basically the legacy ExpansionPass, only restricted to EinsumNodes. It still needs to run in a pipeline to ensure finding multiple EinsumNodes per block. This is temporary, because Einsum is the only node that already supported splitting a block, which the new expansion disallows, as it should handle it itself when needed (but that part is not yet implemented)

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