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

[via llvm-commits]

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@@ -1495,13 +1495,25 @@ class OpenMPIRBuilder {
   /// Collection of regions that need to be outlined during finalization.
   SmallVector<OutlineInfo, 16> OutlineInfos;
 
+  /// A collection of candidate target functions that's constant allocas will
+  /// attempt to be raised on a call of finalize after all currently enqueued
+  /// outline info's have been processed.
+  SmallVector<llvm::Function *, 16> ConstantAllocaRaiseCandidates;
+
   /// Collection of owned canonical loop objects that eventually need to be
   /// free'd.
   std::forward_list<CanonicalLoopInfo> LoopInfos;
 
   /// Add a new region that will be outlined later.
   void addOutlineInfo(OutlineInfo &&OI) { OutlineInfos.emplace_back(OI); }
 
+  /// Add a function that's constant allocas will attempt to be raised on a
+  /// call of finalize after all currently enqueued outline info's have been
+  /// processed.
+  void addConstantAllocaRaiseCandidates(Function *F) {
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agozillon wrote:

I don't think so if we don't wish it to be, it was primarily to mimic the current style we use for addOutlineInfo if I recall correctly. Happy to change it!

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