[opt] Properly handle FuncCallStmt in CFG and simplify passes

[lin-hitonami]

Issue: #602

Assuming FuncCallStmt can load or modify any address. I will write a pass to find out all the addresses loaded and modified in a FuncCallStmt later.

🤖 Generated by Copilot at cf4766c

Summary

📞🔧🧪

This pull request enhances the control flow graph analysis and optimization to support function calls in taichi kernels. It also improves the simplification of basic blocks and tests some experimental features of taichi. The main files affected are taichi/ir/control_flow_graph.cpp, taichi/transforms/simplify.cpp, and tests/python/test_function.py.

We unleash the power of function calls
We optimize the control flow graph
We test the limits of taichi's core
We simplify the basic blocks of wrath

Walkthrough

• Add support for function calls in control flow graph analysis and optimization (link, link)
• Prevent simplifying function call statements that may have side effects or modify global variables (link, link)
• Test the experimental template feature that allows passing arguments to functions as template parameters (link, link)
• Test the support for assertions inside kernels (link, link, link)
• Remove a redundant check for function call statements in BasicBlockSimplify (link)
• Remove a comment that is no longer relevant in test_function.py (link)

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