Add cf ("control-flow") module and split cfg into cf::unstructured vs cf::structurize.
#26
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Similar to (and currently based on):
memmodule (for "memory" ops/passes/etc.), out ofqptr. #25The only non-trivial change is splitting
cfginto two modules (cf::unstructuredfor the CFG definition itself, andcf::structurizefor the structurization algorithm).Apart from that,
cfgssa,SelectionKindandExitInvocationKindare all moved tocf.This refactor is less important for now, but future work will likely add new modules in
cf, especially for interprocedural passes (e.g. inlining, emulating exceptional control-flow and recursive calls, etc.).