[Bug libdw/28573] New: Provide an dwarf_begin interface to open (single-file) DWO or GNU_LTO Dwarf subset

["mark at klomp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28573

            Bug ID: 28573
           Summary: Provide an dwarf_begin interface to open (single-file)
                    DWO or GNU_LTO Dwarf subset
           Product: elfutils
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libdw
          Assignee: unassigned at sourceware dot org
          Reporter: mark at klomp dot org
                CC: elfutils-devel at sourceware dot org
  Target Milestone: ---

To fix https://sourceware.org/bugzilla/show_bug.cgi?id=27367 "invalid loclists
data with -ffat-lto-objects" dwarf_begin_elf now checks to see which DWARF
subset is in the debug ELF file. And it picks the "plain" (.debug sections)
over "dwo" (.debug_...dwo sections) over "lto" (.gnu.debuglto_.debug sections)
in case multiple are in the same file. We have to pick one because mixing the
sections causes chaos.

But the user might want to pick a different set. In particular the user might
want to pick "single file" DWO (where the .dwo sections are in the same file as
the skeleton plain debug sections).

So we want to have a dwarf_begin variant with a flag to pick such a subset.

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