更正有符号整数左移的相关未定义行为描述#75
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C++20 起有符号整数的左移的限制变成与无符号整数一样了，见 P1236R1。
C++20 前相关限制被缺陷报告 CWG1457 修改过，应该反映 CWG1457 修改后的状况。