stage1 指针计算类型的错误修复 as运算符优先级的修改 ir2vm的bug修复

stage0/spl_cli.c

@@ -637,10 +637,14 @@ int main(int argc, const char **argv) {
 
     spl_vm_t vm;
     spl_vm_init(&vm);
-    if (o.debug)
+    if (o.debug) {
+        fprintf(stderr, "spl_cli: debug mode on\n");
         spl_vm_set_debug(&vm, 1);
-    if (o.trace)
+    }
+    if (o.trace) {
+        fprintf(stderr, "spl_cli: trace mode on\n");
         spl_vm_set_trace(&vm, 1);
+    }
     if (spl_vm_load_prog(&vm, &prog) != 0) {
         fprintf(stderr, "spl_cli: failed to load prog\n");
         spl_vm_drop(&vm);