add WITH_DBUG_TRACE CMake variable

This is a way do disable DBUG_ENTER()/DBUG_EXIT() stuff which is
needed to dbug trace. Those who doesn't need it may avoid tests
slowdown with -DWITH_DBUG_TRACE=OFF

dbug/tests.c: add define which is neede always in this test

innodb.log_file_name_debug.test: do not depend on DBUG trace stuff
in test

Benchmark results: each test eats less CPU and you can have more
parallel jobs in MTR.

patched:
./mtr -mem -par=8 -suite=innodb  185.34s user 86.85s system 133% cpu 3:23.27 total
./mtr -mem -par=8 -suite=main    80.96s  user 36.01s system 182% cpu 1:04.07 total

main.select                              [ pass ]   1660
main.select                              [ pass ]   1513
main.select                              [ pass ]   1543
main.select                              [ pass ]   1660
main.select                              [ pass ]   1521
main.select                              [ pass ]   1511
main.select                              [ pass ]   1508
main.select                              [ pass ]   1520
main.select                              [ pass ]   1514
main.select                              [ pass ]   1522

vanilla:
./mtr -mem -par=8 -suite=innodb  203.61s user 92.16s system 140% cpu 3:30.16 total
./mtr -mem -par=8 -suite=main    94.11s  user 35.51s system 206% cpu 1:02.69 total

main.select                              [ pass ]   2032
main.select                              [ pass ]   2017
main.select                              [ pass ]   2040
main.select                              [ pass ]   2183
main.select                              [ pass ]   2253
main.select                              [ pass ]   2075
main.select                              [ pass ]   2109
main.select                              [ pass ]   2080
main.select                              [ pass ]   2098
main.select                              [ pass ]   2114

CMakeLists.txt

@@ -243,6 +243,11 @@ IF(SECURITY_HARDENED)
   MY_CHECK_AND_SET_COMPILER_FLAG("-D_FORTIFY_SOURCE=2" RELEASE RELWITHDEBINFO)
 ENDIF()
 
+OPTION(WITH_DBUG_TRACE "Enable DBUG_ENTER()/DBUG_EXIT()" ON)
+IF(WITH_DBUG_TRACE)
+  ADD_DEFINITIONS(-DDBUG_TRACE)
+ENDIF()
+
 # Always enable debug sync for debug builds.
 SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -DENABLED_DEBUG_SYNC")
 SET(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DENABLED_DEBUG_SYNC")

dbug/tests.c

@@ -4,6 +4,10 @@
 
 char *push1=0;
 
+#ifndef DBUG_TRACE
+#define DBUG_TRACE
+#endif
+
 #include <my_global.h>  /* This includes dbug.h */
 #include <my_sys.h>
 #include <my_pthread.h>

include/my_dbug.h

@@ -64,6 +64,7 @@ extern void dbug_swap_code_state(void **code_state_store);
 extern void dbug_free_code_state(void **code_state_store);
 extern  const char* _db_get_func_(void);
 
+#ifdef DBUG_TRACE
 #define DBUG_LEAVE do { \
     _db_stack_frame_.line= __LINE__; \
     _db_return_ (&_db_stack_frame_); \
@@ -82,6 +83,13 @@ extern  const char* _db_get_func_(void);
 #define DBUG_VOID_RETURN do {DBUG_LEAVE; return;} while(0)
 #endif
 
+#else
+#define DBUG_LEAVE
+#define DBUG_ENTER(a)
+#define DBUG_RETURN(a1) return(a1)
+#define DBUG_VOID_RETURN return
+#endif
+
 #define DBUG_EXECUTE(keyword,a1) \
         do {if (_db_keyword_(0, (keyword), 0)) { a1 }} while(0)
 #define DBUG_EXECUTE_IF(keyword,a1) \

mysql-test/suite/innodb/r/log_file_name_debug.result

@@ -10,5 +10,5 @@ ERROR 42000: Unknown storage engine 'InnoDB'
 FOUND 1 /InnoDB: Tablespace 4294967280 was not found at .*, but there were no modifications either/ in mysqld.1.err
 SELECT * FROM t1;
 ERROR 42000: Unknown storage engine 'InnoDB'
-FOUND 1 /srv_prepare_to_delete_redo_log_files: ib_log: MLOG_CHECKPOINT.* written/ in mysqld.1.err
+FOUND 1 /ib_log: MLOG_CHECKPOINT.* written/ in mysqld.1.err
 DROP TABLE t1;

mysql-test/suite/innodb/t/log_file_name_debug.test

@@ -39,7 +39,7 @@ SELECT * FROM t1;
 --source include/restart_mysqld.inc
 --error ER_UNKNOWN_STORAGE_ENGINE
 SELECT * FROM t1;
---let SEARCH_PATTERN= srv_prepare_to_delete_redo_log_files: ib_log: MLOG_CHECKPOINT.* written
+--let SEARCH_PATTERN= ib_log: MLOG_CHECKPOINT.* written
 --source include/search_pattern_in_file.inc
 
 --let $restart_parameters=