更新IR，.g4修改

src/include/IR.h

@@ -1575,6 +1575,7 @@ class ConstantVariable : public User, public LVal {
   Value* getByIndex(unsigned index) const { return initValues.getValue(index); }  ///< 通过一维位置index获取值
   Value* getByIndices(const std::vector<Value *> &indices) const {
     int index = 0;
+    // 计算偏移量
     for (size_t i = 0; i < indices.size(); i++) {
       index = dynamic_cast<ConstantValue *>(getDim(i))->getInt() * index +
               dynamic_cast<ConstantValue *>(indices[i])->getInt();