bdd6b36a93
In this patch, some OMPIRBuilder codegen functions and callbacks are updated to work with arrays of deallocation insertion points. The purpose of this is to enable the replacement of `alloca`s with other types of allocations that require explicit deallocations in a way that makes it possible for `CodeExtractor` instances created during OMPIRBuilder finalization to also use them. The OpenMP to LLVM IR MLIR translation pass is updated to properly store and forward deallocation points together with their matching allocation point to the OMPIRBuilder. Currently, only the `DeviceSharedMemCodeExtractor` uses this feature to get the `CodeExtractor` to use device shared memory for intermediate allocations when outlining a parallel region inside of a Generic kernel (code path that is only used by Flang via MLIR, currently). However, long term this might also be useful to refactor finalization of variables with destructors, potentially reducing the use of callbacks and simplifying privatization and reductions. Instead of a single deallocation point, lists of those are used. This is to cover cases where there are multiple exit blocks originating from a single entry. If an allocation needing explicit deallocation is placed in the entry block of such cases, it would need to be deallocated before each of the exits.
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