[Bug tapsets/30407] Tapset function print_ubacktrace_fileline() no longer works with DWARF5

["wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30407

William Cohen <wcohen at redhat dot com> changed:

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                 CC|                            |wcohen at redhat dot com

--- Comment #3 from William Cohen <wcohen at redhat dot com> ---
Had some additional discussion with Martin on email on how to fix this. For
this PR (and 29984) there are two parts that need to be addressed:

1) recognize the dwarf 5 format line info in translate.cxx.  It looks like
https://sourceware.org/bugzilla/show_bug.cgi?id=29984 mentions an area that
needs to be changed to so systemtap copies the line information.

2) have the runtime _stp_linenumber_lookup in runtime/sym.c be able to handle
the dwarf 5 line number headers.

Need to refer to the dwarf debuginfo manuals for dwarf4 and dwarf5 from
https://dwarfstd.org/, section 6.2.4 "The Line Number Program Header" for
details on the differences.  There are differences in the dwarf5 line number
header: address_size, segment_selector_size, directories_count, directories,
etc. in dwarf5 .

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