stage1 修复设计问题 实现ir2vm

stage0/spl_mcode.c

@@ -343,6 +343,14 @@ int spl_prog_store_to_file(const char *fname, spl_prog_t *prog) {
     return 0;
 }
 
+int spl_prog_add_instr(spl_prog_t *prog, uint8_t opcode, uint8_t type, spl_val_t imm) {
+    if (!prog)
+        return 0;
+    spl_ins_t ins = (spl_ins_t){.opcode = opcode, .type = type, .imm = imm};
+    vec_push(prog->insns, ins);
+    return vec_size(prog->insns);
+}
+
 int spl_prog_add_func(spl_prog_t *prog, spl_func_t *func) {
     if (!prog || !func)
         return 0;