Revert "issue-654: [pprof] handle split text segments"

This reverts commit 8c3dc52fcf.

People have reported issues with this so lets stay safe and use older
even if less powerful code.

src/pprof

@@ -4511,7 +4511,6 @@ sub ParseLibraries {
   my $zero_offset = HexExtend("0");
 
   my $buildvar = "";
-  my $priorlib = "";
   foreach my $l (split("\n", $map)) {
     if ($l =~ m/^\s*build=(.*)$/) {
       $buildvar = $1;
@@ -4568,20 +4567,7 @@ sub ParseLibraries {
       }
     }
 
-    # If we find multiple executable segments for a single library, merge them
-    # into a single entry that spans the complete address range.
-    if ($lib eq $priorlib) {
-      my $prior = pop(@{$result});
-      if ($start gt @$prior[1]) {
-        $start = @$prior[1];
-      } else {
-        $finish = @$prior[2];
-      }
-      # TODO $offset may be wrong if .text is not in the final segment.
-    }
-
     push(@{$result}, [$lib, $start, $finish, $offset]);
-    $priorlib = $lib;
   }
 
   # Append special entry for additional library (not relocated)