Make .pdmp file more reproducible

Problem reported by Ulrich Müller
<https://lists.gnu.org/r/emacs-devel/2019-11/msg00757.html>
and diagnosed by Andreas Schwab
<https://lists.gnu.org/r/emacs-devel/2019-11/msg00774.html>.
* src/sysdep.c (maybe_disable_address_randomization):
Disable ASLR if any kind of dumping, instead of merely if
unexec dumping.  Omit first arg for simplicity; all uses changed.

src/emacs.c

@@ -1054,8 +1054,7 @@ main (int argc, char **argv)
     load_pdump (argc, argv);
 #endif
 
-  argc = maybe_disable_address_randomization (
-    will_dump_with_unexec_p (), argc, argv);
+  argc = maybe_disable_address_randomization (argc, argv);
 
 #if defined GNU_LINUX && defined HAVE_UNEXEC
   if (!initialized)

src/lisp.h

@@ -4576,10 +4576,10 @@ struct tty_display_info;
 
 /* Defined in sysdep.c.  */
 #ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
-extern int maybe_disable_address_randomization (bool, int, char **);
+extern int maybe_disable_address_randomization (int, char **);
 #else
 INLINE int
-maybe_disable_address_randomization (bool dumping, int argc, char **argv)
+maybe_disable_address_randomization (int argc, char **argv)
 {
   return argc;
 }

src/sysdep.c

@@ -158,14 +158,17 @@ static int exec_personality;
 /* Try to disable randomization if the current process needs it and
    does not appear to have it already.  */
 int
-maybe_disable_address_randomization (bool dumping, int argc, char **argv)
+maybe_disable_address_randomization (int argc, char **argv)
 {
   /* Undocumented Emacs option used only by this function.  */
   static char const aslr_disabled_option[] = "--__aslr-disabled";
 
   if (argc < 2 || strcmp (argv[1], aslr_disabled_option) != 0)
     {
-      bool disable_aslr = dumping;
+      /* If dumping via unexec, ASLR must be disabled, as otherwise
+	 data may be scattered and undumpable as a simple executable.
+	 If pdumping, disabling ASLR makes the .pdmp file reproducible.  */
+      bool disable_aslr = will_dump_p ();
 # ifdef __PPC64__
       disable_aslr = true;
 # endif