Remove dead code is_thd_killed()

include/mysql/service_kill_statement.h

-/* Copyright (c) 2013, Monty Program Ab.
+/* Copyright (c) 2013, 2018, MariaDB
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -27,7 +27,7 @@
   time-consuming loops, and gracefully abort the operation if it is
   non-zero.
 
-  thd_is_killed(thd)
+  thd_killed(thd)
   @return 0 - no KILL statement was issued, continue normally
   @return 1 - there was a KILL statement, abort the execution.
 

storage/xtradb/handler/ha_innodb.cc

@@ -4,7 +4,7 @@ Copyright (c) 2000, 2018, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2008, 2009 Google Inc.
 Copyright (c) 2009, Percona Inc.
 Copyright (c) 2012, Facebook Inc.
-Copyright (c) 2013, 2017, MariaDB Corporation.
+Copyright (c) 2013, 2018, MariaDB Corporation.
 
 Portions of this file contain modifications contributed and copyrighted by
 Google, Inc. Those modifications are gratefully acknowledged and are described
@@ -19611,15 +19611,6 @@ int ha_innobase::multi_range_read_explain_info(uint mrr_mode, char *str, size_t
   return ds_mrr.dsmrr_explain_info(mrr_mode, str, size);
 }
 
-/* 
-  A helper function used only in index_cond_func_innodb
-*/
-
-bool ha_innobase::is_thd_killed()
-{ 
-  return thd_kill_level(user_thd);
-}
-
 /**********************************************************************
 Issue a warning that the row is too big. */
 UNIV_INTERN

storage/xtradb/handler/ha_innodb.h

 /*****************************************************************************
 
 Copyright (c) 2000, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2013, 2017, MariaDB Corporation.
+Copyright (c) 2013, 2018, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -364,10 +364,6 @@ class ha_innobase: public handler
 	* @return idx_cond if pushed; NULL if not pushed
 	*/
 	class Item* idx_cond_push(uint keyno, class Item* idx_cond);
-
-        /* An helper function for index_cond_func_innodb: */
-        bool is_thd_killed();
-
 private:
 	/** The multi range read session object */
 	DsMrr_impl ds_mrr;