[mlir] [llvm] [OpenMP][MLIR][OMPIRBuilder] Add a small optional constant alloca raise function pass to finalize, utilised in convertTarget (PR #78818)

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agozillon wrote:

Thank you very much for the review @TIFitis I'll update this at the beginning of next week. And I'll hold off until we get a second reviewer that can sign off.

https://github.com/llvm/llvm-project/pull/78818