fix(ir): 修改了一下context的管理

src/ir/Function.cpp

@@ -13,6 +13,7 @@ Function::Function(std::string name, std::shared_ptr<Type> ret_type)
 BasicBlock* Function::CreateBlock(const std::string& name) {
   auto block = std::make_unique<BasicBlock>(name);
   auto* ptr = block.get();
+  ptr->set_parent(this);
   blocks_.push_back(std::move(block));
   if (!entry_) {
     entry_ = ptr;