[llvm] [mlir] [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:

Just a little forewarning, I will land this PR tomorrow, so if anyone has any concerns now would be the time to bring them forward! However, we can always revert the PR if there is afterwards (or any unexpected issues), but bringing them up just now would be ideal :-) 

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