[dataflow] Enable csyn for previous design under new use-def chain

[AdrianLiu00]

Description

This PR enables the csyn for previous systolic design and also improves test session.

Problems

Previous design was hard to achieve csyn directly from high-level programming, because the original use-def chain failed to search and mark every target partitioned array. We used to have to add the primitives manually in hls code.

Proposed Solutions

The new use-def chain makes it easy to add partition primitives in the high-level program.

Checklist

• PR's title starts with a category (e.g. [Bugfix], [IR], [Builder], etc)
• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage (It would be better to provide ~2 different test cases to test the robustness of your code)
• Code is well-documented

[AdrianLiu00]

By the way, I'll try to equip the unified systolic array with multi-cache in the next couple days. Then I will maybe sort out and categorize all the existing systolic designs in the dataflow directory to make it well-organized.

[chhzh123]

LGTM. Thx!