Merge #13633: Drop dead code from Stacks

5617840 Drop dead code from Stacks (Ben Woosley)

Pull request description:

  Stacks is local to this file, and only used in DataFromTransaction, so
  it's easy to confirm this code is unused.

Tree-SHA512: cc680c99f9b31cb56db70f453087d642f83906ce594c07a6bf3e61427cfbee41441495d440b240419ba3386582cf0670c0999b2f51e7fd56b00e0a0f3f618845

Author: laanwj

src/script/sign.cpp

@@ -288,18 +288,11 @@ struct Stacks
     std::vector<valtype> script;
     std::vector<valtype> witness;
 
-    Stacks() {}
-    explicit Stacks(const std::vector<valtype>& scriptSigStack_) : script(scriptSigStack_), witness() {}
+    Stacks() = delete;
+    Stacks(const Stacks&) = delete;
     explicit Stacks(const SignatureData& data) : witness(data.scriptWitness.stack) {
         EvalScript(script, data.scriptSig, SCRIPT_VERIFY_STRICTENC, BaseSignatureChecker(), SigVersion::BASE);
     }
-
-    SignatureData Output() const {
-        SignatureData result;
-        result.scriptSig = PushAll(script);
-        result.scriptWitness.stack = witness;
-        return result;
-    }
 };
 }