[llvm] [llvm][dwarfdump] Add --child-tags option to filter by DWARF tags (PR #165720)

[Adrian Prantl via llvm-commits]

https://github.com/adrian-prantl commented:

I don't remember how we generate the dwarfdump manpage, but can you make to update it, too? (Unless we generate it from the --help output)

https://github.com/llvm/llvm-project/pull/165720