trie: remove redundant returns + use stacktrie where applicable (#22760)

* trie: add benchmark for proofless range

* trie: remove unused returns + use stacktrie

core/state/snapshot/generate.go

@@ -368,7 +368,7 @@ func (dl *diskLayer) proveRange(stats *generatorStats, root common.Hash, prefix
 	}
 	// Verify the snapshot segment with range prover, ensure that all flat states
 	// in this range correspond to merkle trie.
-	_, _, _, cont, err := trie.VerifyRangeProof(root, origin, last, keys, vals, proof)
+	_, cont, err := trie.VerifyRangeProof(root, origin, last, keys, vals, proof)
 	return &proofResult{
 			keys:     keys,
 			vals:     vals,