Commits on Sep 19, 2024

1. [CIR] Split cir-simplify into two passes …

   This patch splits the old cir-simplify pass into two new passes, namely
   cir-canonicalize and cir-simplify (the new cir-simplify). The cir-canonicalize
   pass runs transformations that do not affect CIR-to-source fidelity much, such
   as operation folding and redundant operation elimination. On the other hand, the
   new cir-simplify pass runs transformations that may significantly change the
   code and break high-level code analysis passes, such as more aggresive code
   optimizations.
   
   This patch also updates the CIR-to-CIR pipeline to fit these two new passes. The
   cir-canonicalize pass is moved to the very front of the pipeline, while the new
   cir-simplify pass is moved to the back of the pipeline (but still before
   lowering prepare of course). Additionally, the new cir-simplify now only runs
   when the user specifies a non-zero optimization level on the frontend.

   

   Lancern committed Sep 19, 2024
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