README for Memory Allocation Debugging

If it is necessary or desired to debug the memory allocation
process in LZMA, edit the file C/Alloc.c and uncomment the
line:

/* #define _SZ_ALLOC_DEBUG */

Then, add this to the Makefile and relink. This output will
show chunks of memory Alloc uses during LZMA compression.

Output will appear similar to this:

Alloc     284484 bytes, count =          0,  addr = 44251008
Alloc      65536 bytes, count =          1,  addr =  80636F0
Alloc      12288 bytes, count =          2,  addr =  80736F8
Alloc      12288 bytes, count =          3,  addr =  8076700
Alloc    4456448 bytes, count =          4,  addr = 43E10008
Alloc  102877690 bytes, count =          5,  addr = 3DBF3008
Alloc  604246024 bytes, count =          6,  addr = 19BB1008
Free; count =          6,  addr = 43E10008
Free; count =          5,  addr = 19BB1008
Free; count =          4,  addr = 3DBF3008
Free; count =          3,  addr =  80736F8
Free; count =          2,  addr =  8076700
Free; count =          1,  addr =  80636F0
Free; count =          0,  addr = 44251008

As you can see, LZMA takes large chunks of ram and sometimes
it can use more than what is available and return an
SZ_ERROR_MEM (2) code.
