BUG#16069598 - SERVER CRASH BY NULL POINTER DEREFERENCING IN                 MEM_HEAP_CREATE_BLOCK() 
BUG#16069598 - SERVER CRASH BY NULL POINTER DEREFERENCING IN 
               MEM_HEAP_CREATE_BLOCK() 

PROBLEM
-------

If we give start mysqld with the option --innodb_log_buffer_size=50GB
,then  mem_area_alloc() function fails to allocate memory and returns
NULL.In debug version we assert at this point,but there is no check in
release version and we get a segmentation fault.

FIX
---
Added a log message saying that we are unable to allocate memory.
After this message we assert.

[Approved by Kevin http://rb.no.oracle.com/rb/r/2065 ]


ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix,davidl-zend/zenddbi,ollie314/server,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,davidl-zend/zenddbi,ollie314/server,natsys/mariadb_10.2,slanterns/server,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,flynn1973/mariadb-aix,natsys/mariadb_10.2,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,davidl-zend/zenddbi,ollie314/server,ollie314/server,natsys/mariadb_10.2,davidl-zend/zenddbi,davidl-zend/zenddbi,natsys/mariadb_10.2,davidl-zend/zenddbi,ollie314/server,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,ollie314/server,davidl-zend/zenddbi,davidl-zend/zenddbi,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,davidl-zend/zenddbi