5d8813dec6
Initial implementations of dense dataflow analyses feature special cases for operations that have region- or call-based control flow by leveraging the corresponding interfaces. This is not necessarily sufficient as these operations may influence the dataflow state by themselves as well we through the control flow. For example, `linalg.generic` and similar operations have region-based control flow and their proper memory effects, so any memory-related analyses such as last-writer require processing `linalg.generic` directly instead of, or in addition to, the region-based flow. Provide hooks to customize the processing of operations with region- cand call-based contol flow in forward and backward dense dataflow analysis. These hooks are trigerred when control flow is transferred between the "main" operation, i.e. the call or the region owner, and another region. Such an apporach allows the analyses to update the lattice before and/or after the regions. In the `linalg.generic` example, the reads from memory are interpreted as happening before the body region and the writes to memory are interpreted as happening after the body region. Using these hooks in generic analysis may require introducing additional interfaces, but for now assume that the specific analysis have spceial cases for the (rare) operaitons with call- and region-based control flow that need additional processing. Reviewed By: Mogball, phisiart Differential Revision: https://reviews.llvm.org/D155757
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