[Bug translator/25549] Systemtap unable to find many probe points available in code compiled with LTO enable

[wcohen at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25549

--- Comment #2 from William Cohen <wcohen at redhat dot com> ---
The eu-readelf --debug-dump=info output of the non-lto and lto versions of the
reproducer show one difference that is maybe be tripping up systemtap.

On non-lto:

 [   2f1]    subprogram           abbrev: 16
             external             (flag_present) yes
             name                 (strp) "main"
             decl_file            (data1) pr25549.cxx (1)
             decl_line            (data1) 3
             decl_column          (data1) 5
             type                 (ref4) [    61]
             low_pc               (addr) 0x0000000000401040 <main>
             high_pc              (data8) 21 (0x0000000000401055
<.annobin_static_reloc.c_end.hot>)
             frame_base           (exprloc) 
              [ 0] call_frame_cfa
             GNU_all_call_sites   (flag_present) yes
             sibling              (ref4) [   357]

on lto one, no low_pc, high_pc:

 [   36e]    subprogram           abbrev: 16
             external             (flag_present) yes
             name                 (strp) "main"
             decl_file            (data1) pr25549.cxx (7)
             decl_line            (data1) 3
             decl_column          (data1) 5
             type                 (ref4) [    de]
             sibling              (ref4) [   397]

Comparing the execution of the working non-LTO and the non-working LTO  it
looks like the following line tapset.cxx:2403 returns nothing to iterate over,
so no lines are reported for the LTO version of the code :

          auto bfis = q->filtered_all();

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