fix: catchup to upstream loader changes

web3.js/src/system-program.js

@@ -105,4 +105,28 @@ export class SystemProgram {
       userdata,
     });
   }
+
+  /**
+   * Spawn a new program from an account
+   */
+  static spawn(programId: PublicKey): Transaction {
+    const userdataLayout = BufferLayout.struct([
+      BufferLayout.u32('instruction'),
+    ]);
+
+    const userdata = Buffer.alloc(userdataLayout.span);
+    userdataLayout.encode(
+      {
+        instruction: 3, // Spawn instruction
+      },
+      userdata,
+    );
+
+    return new Transaction({
+      fee: 0,
+      keys: [programId],
+      programId: SystemProgram.programId,
+      userdata,
+    });
+  }
 }