[LLDB] Add a child property to compliment the existing parent property (#168619) I've been working on some scripts that evaluate the parent and child frame. It's been very annoying that the parent frame has a property but not the child. So I've added this to the extensions, I would've preferred to return None, but because the existing impl returns an invalid SBFrame, so I'm conforming to that API. ``` (lldb) script Python Interactive Interpreter. To exit, type 'quit()', 'exit()' or Ctrl-D. >>> lldb.frame frame #0: 0x0000555555555200 fib.out`main >>> lldb.frame.parent frame #1: 0x00007ffff782a610 libc.so.6`__libc_start_call_main + 128 >>> lldb.frame.parent.child frame #0: 0x0000555555555200 fib.out`main ```
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