NAME
        FreeMem -- deallocate with knowledge

   SYNOPSIS
        FreeMem(memoryBlock, byteSize)
                A1           D0

        void FreeMem(void *,ULONG);

   FUNCTION
        Free a region of memory, returning it to the system pool from which
        it came.  Freeing partial blocks back into the system pool is
        unwise.

   NOTE
        If a block of memory is freed twice, the system will Guru. The
        alert is an_freetwice ($01000009).   if you pass the wrong pointer,
        you will probably see AN_MemCorrupt $01000005.  Future versions may
        add more sanity checks to the memory lists.

   INPUTS
        memoryBlock - pointer to the memory block to free
        byteSize - the size of the desired block in bytes.  (The operating
                system will automatically round this number to a multiple of
                the system memory chunk size)

   SEE ALSO
        allocmem()