[Ada] Fix infinite loop with signals and backtraces on x86/Solaris

[Arnaud Charlet <charlet at adacore dot com>]

This change makes sure the runtime doesn't enter an infinite loop when handling
signals on x86/Solaris, if the program has been compiled with backtraces turned
on (-bargs -E).

The following test must return when compiled with -gnatp -bargs -E:

with Ada.Text_IO;

procedure Segv is
   type Int_Ptr is access all Integer;
   function Ident return Int_Ptr is
   begin return null; end;
   Data : Int_Ptr := Ident;
begin
   Data.all := 0;
exception
   when others =>
      Ada.Text_IO.Put_Line ("SEGV Handler");
end;

Tested on x86_64-pc-linux-gnu, committed on trunk

2009-06-11  Eric Botcazou  <ebotcazou@adacore.com>

	* tracebak.c (i386 section): Define IS_BAD_PTR on Solaris.

Attachment: difs
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