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

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

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

--- Comment #5 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 15161
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15161&action=edit
WIP patch

The attached patch doesn't properly parse the .debug_line header (yet) to find
correct pointers to the .debug_line_str section.  Next version will try to do
that.

Demo:
-----------------------------------
# cat a.c
int main(void) {
    return 0;
}
# 
# gcc -g -gdwarf-5 a.c -o prog5
# gcc -g -gdwarf-4 a.c -o prog4
#
# eu-readelf --debug-dump=info prog4 | fgrep -i produc
           producer             (strp) "GNU C17 13.1.1 20230614 (Red Hat
13.1.1-4) -mtune=generic -march=x86-64 -g -gdwarf-4"
# eu-readelf --debug-dump=info prog5 | fgrep -i produc
           producer             (strp) "GNU C17 13.1.1 20230614 (Red Hat
13.1.1-4) -mtune=generic -march=x86-64 -g -gdwarf-5"
# 
# stap --ldd -e 'probe process.function("main") { print_ubacktrace_fileline()
}' -c ./prog4 
 0x40110a : main+0x4/0xe at /root/test/a.c:2 [/root/test/prog4]
 0x7f9d3c42814a : __libc_start_call_main+0x7a/0xb0 [/usr/lib64/libc.so.6]
 0x7f9d3c42820b : __libc_start_main@GLIBC_2.2.5+0x8b/0x160
[/usr/lib64/libc.so.6]
 0x401045 : _start+0x25/0x30 [/root/test/prog4]
# 
# stap --ldd -e 'probe process.function("main") { print_ubacktrace_fileline()
}' -c ./prog5
 0x40110a : main+0x4/0xe at /root/test/a.c:2 [/root/test/prog5]
 0x7fba8ae2814a : __libc_start_call_main+0x7a/0xb0 [/usr/lib64/libc.so.6]
 0x7fba8ae2820b : __libc_start_main@GLIBC_2.2.5+0x8b/0x160
[/usr/lib64/libc.so.6]
 0x401045 : _start+0x25/0x30 [/root/test/prog5]
#

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