InnoDB leaks memory for some static objects

InnoDB is leaking some memory for statically allocated objects. The leaks were caught by some changes to SAFEMALLOC that allow instrumenting operator new. I did not try to find out how to make AddressSanitizer report them.

The impact is small, because the few dozen bytes will be freed by the operating system when the process is terminated. But, because memory leaks can be a telltale sign of subsystems not being closed down properly, we prefer to fix them.

The leaks were identified by monty and cvicentiu.