Introduced hxcpp_api_level 310
Returns stats on memory usage:
MEM_INFO_USAGE - estimate of how much is needed by program (at last collect)
MEM_INFO_RESERVED - memory allocated for possible use
MEM_INFO_CURRENT - memory in use, includes uncollected garbage.
This will generally saw-tooth between USAGE and RESERVED
MEM_INFO_LARGE- Size of separate pool used for large allocs. Included in all the above.