stage2 提供c后端 提交stage1的测试

stage2/sys/vm.spl

@@ -5,7 +5,7 @@ type spl_vm_val_t = u64; // usize
 #extern(vm) fn vm_drop(vm: *any): void;
 
 #extern(vm) fn vm_load(vm: *any, fpath: *u8): void;
-#extern(vm) fn vm_load_from_buffer(vm: *any, buffer: []u8): void;
+#extern(vm) fn vm_load_from_buffer(vm: *any, buf: *any, len: usize): i32;
 
 #extern(vm) fn vm_push(vm: *any, val: spl_vm_val_t): void;
 // TODO