[Bug gdb/28063] ASan crash in value_primitive_field / value_contents_copy_raw when printing std::tuple

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28063

--- Comment #3 from Simon Marchi <simark at simark dot ca> ---
And the gcc version:

$ gcc --version
gcc (GCC) 11.1.0

If we look at the value_primitive_field frame, I see:

  (top-gdb) p offset
  $5 = -1

which comes from:

(top-gdb) p arg_type.main_type.name
$6 = 0x621001a80ae0 "std::_Head_base<1,
std::default_delete<private_thread_info>, true>"
(top-gdb) p arg_type.main_type.flds_bnds.fields[0].loc.bitpos 
$7 = -8

And indeed, in the DWARF, in the gdb file, I have:

0x000cbdf5:       DW_TAG_member
                    DW_AT_name [DW_FORM_strp]   ("_M_head_impl")
                    DW_AT_decl_file [DW_FORM_implicit_const]   
("/usr/include/c++/11.1.0/tuple")
                    DW_AT_decl_line [DW_FORM_implicit_const]    (125)
                    DW_AT_decl_column [DW_FORM_implicit_const]  (39)
                    DW_AT_type [DW_FORM_ref4]   (0x000cbaff
"default_delete<private_thread_info>")
                    DW_AT_data_member_location [DW_FORM_implicit_const] (-1)

I don't know if the DW_AT_data_member_location value of -1 is right or not.

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