Fixed some tests that failes when built with valgrind

Example build: ./BUILD/compile-pentium64-valgrind-max

Fixes:
- sp-no-valgrind failed if binary was built for valgrind as in this case
  mem_root is allocated in very small hunks which the test cannot handle.
  Fixed by testing of valgrind build
- truncate_notembedded failed in reap because of more memory used.
  Fixed by allowing reap to fail too

mysql-test/main/truncate_notembedded.test

@@ -18,6 +18,7 @@ SELECT * FROM t1;
 UNLOCK TABLES;
 
 --connection con1
+--error 0,ER_OPTION_PREVENTS_STATEMENT
 --reap
 # This may work or fail as different servers uses different amount of
 # memory and the statement may work or not. What is important is that we