Long story short: DW_TAG_lexical_blocks are annoying.
In order to search the full tree of children of a given dwarf entry, we
need a recursive function somewhere. We might as well make this function
a part of the DwarfEntry class so we can share it with other scripts.
Note this is roughly the same as collect_dwarf_info, but limited to
the children of a given dwarf entry.
This is useful for ongoing stack.py rework.
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