Add aload opcode

Author: hankluo6

jvm.c

@@ -577,6 +577,15 @@ stack_entry_t *execute(method_t *method,
             break;
         }
 
+        /* Load object from local variable */
+        case i_aload: {
+            int32_t param = code_buf[pc + 1];
+            object_t *obj = locals[param].entry.ptr_value;
+
+            push_ref(op_stack, obj);
+            pc += 2;
+        } break;
+
         /* Load object from local variable */
         case i_aload_0:
         case i_aload_1: