support gdb_bthread_stack.py in coredump

**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
gdb coredump中执行'bthread_frame id'报错

**Describe the solution you'd like (描述你期望的解决方法)**
简单修改gdb源码，实现在gdb coredump中gdb_bthread_stack.py的功能全部可用

**Describe alternatives you've considered (描述你想到的折衷方案)**

**Additional context/screenshots (更多上下文/截图)**
默认gdb

修改后gdb

Start by reading gdb_bthread_stack.py and reproducing the reported 'bthread_frame id' failure in a GDB coredump, then compare the default and modified GDB behavior shown in the issue. Done means the gdb_bthread_stack.py functionality is available in GDB coredump sessions.

Written by the indexing model from the issue text.