[mlir][acc] Extend PointerLikeType to provide alloc, dealloc, copy (#162328) A variable in an acc data clause operation must have a type that implements either PointerLikeType or a MappableType interface. These interfaces provide the contract that allows acc dialect and its transform passes to interact with a source dialect. One of these requirements is ability to generate code that creates memory for a private copy and ability to initialize that copy from another variable. Thus, update the PointerLikeType API to provide the means to create allocation, deallocation, and copy. This will be used as a way to fill in privatization and firstprivatization recipes. This new API was implemented for memref along with testing to exercise it via the implementation of a testing pass.
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