DocumentSourceSkip and DocumentSourceMatch getNext() should release GetNextResult reference prior to subsequent underlying source getNext() call

The following will cause mongod to abort when this issue is present: Add invariant(false); at the start of the clonedStorage() method in pipeline/document.h DocumentStorage& clonedStorage() { invariant(false); reset(storagePtr()->clone()); return const_cast<DocumentStorage&>(*storagePtr()); } Run the following via mongo shell For DocumentSourceSkip: db.test.insert({x: [1,2,3]}) db.test.aggregate([{$unwind: {path: "$x"}}, {$skip: 3}]); For DocumentSourceMatch: db.test.insert({x: [1,2,3]}) db.test.aggregate([{$unwind: {path: "$x"}},{$match: {x: 2}}]);