Use symbol size as a third index, mainly so that zero-length symbols

(e.g. section start indicators) show up before the symbols they're
indicating the start of.

src/util/sortobjdump.pl

 use warnings;
 
 # Sort the symbol table portion of the output of objdump -ht by
-# section, then by symbol value.  Used to enhance the linker maps
-# produced by "make bin/%.map" by also showing the values of all
-# non-global symbols.
+# section, then by symbol value, then by size.  Used to enhance the
+# linker maps produced by "make bin/%.map" by also showing the values
+# of all non-global symbols.
 
 my %section_idx = ( "*ABS*" => "." );
 my %lines;
     print;
     ( my $index, my $section ) = ( $1, $2 );
     $section_idx{$section} = sprintf ( "%02d", $index );
-  } elsif ( /^([0-9a-fA-F]+)\s.*?\s([\.\*]\S+)\s/ ) {
+  } elsif ( /^([0-9a-fA-F]+)\s.*?\s([\.\*]\S+)\s+([0-9a-fA-F]+)\s/ ) {
     # It's a symbol line - store it in the hash, indexed by
-    # "<section index>.<value>"
-    ( my $value, my $section ) = ( $1, $2 );
+    # "<section index>:<value>:<size>"
+    ( my $value, my $section, my $size ) = ( $1, $2, $3 );
     die "Unrecognised section \"$section\"\n"
 	unless exists $section_idx{$section};
     my $section_idx = $section_idx{$section};
-    $lines{${section_idx}.":".${value}} = $_;
+    my $key = $section_idx.":".$value.":".$size;
+    $lines{$key} ||= '';
+    $lines{$key} .= $_;
   } else {
     # It's a generic header line: just print it.
     print;