unwind-rs
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Properly handle DW_CFA_GNU_args_size
Depends on https://github.com/gimli-rs/gimli/pull/319
Mostly necessary in the case of an i686 backend (unless someone happens upon a compiler/binary that uses them on other archs).
https://www.uclibc.org/docs/psABI-i386.pdf talks about how to use it (section 2.5 "Stack Unwind Algorithm", in "Outgoing arguments area delta" section.)