Revert "Add deprecation warning for intrinsic __CPROVER_allocated_memory in goto_check_c.cpp."

This reverts commit d6c19db.

Author: tautschnig

src/ansi-c/goto_check_c.cpp

@@ -441,17 +441,6 @@ void goto_check_ct::collect_allocations(const goto_functionst &goto_functions)
           "allocated_memory")
         continue;
 
-      const auto function_line = function.source_location().as_string();
-      log.warning() << "**** WARNING: `" CPROVER_PREFIX "allocated_memory' in "
-                    << function_line << messaget::eom;
-      log.warning() << "**** WARNING: `" CPROVER_PREFIX
-                       "allocated_memory' is "
-                       "deprecated and scheduled for deletion "
-                    << "in version 6 and upwards." << messaget::eom;
-      log.warning() << "Please avoid using this intrinsic. For more "
-                       "information, please check issue "
-                    << "cbmc#6872 in Github" << messaget::eom;
-
       const code_function_callt::argumentst &args =
         instruction.call_arguments();
       if(