[Bug breakpoints/18140] New: duplicate DW_TAG_label's in dwarf cause ICE

["aldyh at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18140

            Bug ID: 18140
           Summary: duplicate DW_TAG_label's in dwarf cause ICE
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: aldyh at redhat dot com

This is incorrect dwarf that I mistakenly generated in GCC's debug-early
project.  I am generating two DW_TAG_label's for the same source label, and of
of them doesn't have line information.

reynosa:/build/dearly/gcc$ cat a.c
int
main ()
{
here:
  return 0;
}

Faulty dwarf is:

 <2><4e>: Abbrev Number: 3 (DW_TAG_label)
    <4f>   DW_AT_name        : (indirect string, offset: 0x0): here     
    <53>   DW_AT_decl_file   : 1        
    <54>   DW_AT_decl_line   : 4        
 <2><55>: Abbrev Number: 4 (DW_TAG_label)
    <56>   DW_AT_name        : (indirect string, offset: 0x0): here     
    <5a>   DW_AT_decl_file   : 1        
    <5b>   DW_AT_decl_line   : 4        
    <5c>   DW_AT_low_pc      : 0x4004ca 

End result:

(gdb) b main
Breakpoint 1 at 0x4004ca: file a.c, line 5.
(gdb) r
Starting program: /home/build/dearly/gcc/a.out

Breakpoint 1, main () at a.c:5
5         return 0;
(gdb) b here
/source/binutils-gdb/gdb/linespec.c:2459: internal-error: decode_line_full:
Assertion `result.nelts == 1 || canonical->pre_expanded' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n)

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