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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