style(ir): 纠正代码位置

src/ir/IRBuilder.cpp

@@ -18,6 +18,12 @@ bool IsPtrInt32Type(const std::shared_ptr<Type>& ty) {
 
 }  // namespace
 
+IRBuilder::IRBuilder(BasicBlock* bb) : insertBlock_(bb) {}
+
+void IRBuilder::SetInsertPoint(BasicBlock* bb) { insertBlock_ = bb; }
+
+BasicBlock* IRBuilder::GetInsertBlock() const { return insertBlock_; }
+
 ConstantInt* IRBuilder::CreateConstInt(int v) {
   // 常量不需要挂在基本块里，由 Context 负责去重与生命周期。
   return DefaultContext().GetConstInt(v);
@@ -47,6 +53,11 @@ BinaryInst* IRBuilder::CreateBinary(Opcode op, Value* lhs, Value* rhs,
   return insertBlock_->Append<BinaryInst>(op, lhs->type(), lhs, rhs, name);
 }
 
+BinaryInst* IRBuilder::CreateAdd(Value* lhs, Value* rhs,
+                                 const std::string& name) {
+  return CreateBinary(Opcode::Add, lhs, rhs, name);
+}
+
 AllocaInst* IRBuilder::CreateAllocaI32(const std::string& name) {
   if (!insertBlock_) {
     throw std::runtime_error("IRBuilder 未设置插入点");