[mlir][bufferization] LowerDeallocation: declare helper function private (#67408)

Author: maerhart

mlir/lib/Dialect/Bufferization/Transforms/LowerDeallocations.cpp

@@ -432,6 +432,7 @@ func::FuncOp mlir::bufferization::buildDeallocationLibraryFunction(
   // Generate the func operation itself.
   auto helperFuncOp = func::FuncOp::create(
       loc, "dealloc_helper", builder.getFunctionType(argTypes, {}));
+  helperFuncOp.setVisibility(SymbolTable::Visibility::Private);
   symbolTable.insert(helperFuncOp);
   auto &block = helperFuncOp.getFunctionBody().emplaceBlock();
   block.addArguments(argTypes, SmallVector<Location>(argTypes.size(), loc));

mlir/test/Dialect/Bufferization/Transforms/lower-deallocations.mlir

@@ -120,7 +120,7 @@ func.func @conversion_dealloc_multiple_memrefs_and_retained(%arg0: memref<2xf32>
 //      CHECK: memref.dealloc [[RETAIN_CONDS]]
 //      CHECK: return [[OWNERSHIP0]], [[OWNERSHIP1]]
 
-//      CHECK: func @dealloc_helper
+//      CHECK: func private @dealloc_helper
 // CHECK-SAME: ([[TO_DEALLOC_MR:%.+]]: memref<?xindex>, [[TO_RETAIN_MR:%.+]]: memref<?xindex>,
 // CHECK-SAME: [[CONDS:%.+]]: memref<?xi1>, [[DEALLOC_CONDS_OUT:%.+]]: memref<?xi1>,
 // CHECK-SAME: [[RETAIN_CONDS_OUT:%.+]]: memref<?xi1>)