Remove redundant compute_loop_numbers call

process_goto_program invokes goto_functions.update() right before, which
itself invokes compute_loop_numbers(). Doing so twice is just a waste of
time.

Author: tautschnig

src/goto-programs/process_goto_program.cpp

@@ -87,8 +87,5 @@ bool process_goto_program(
   // recalculate numbers, etc.
   goto_model.goto_functions.update();
 
-  // add loop ids
-  goto_model.goto_functions.compute_loop_numbers();
-
   return false;
 }