From: ZheNing Hu <adlternative@gmail.com>

"alloc_state" may have similar effects with "mem_pool".
Using the new memory pool API may be more beneficial
to our memory management in the future.

So I change them in the "struct parsed_object_pool",and
The corresponding interface has also been changed.
functions "alloc_*_node" now change to "mem_pool_alloc_*_node".

At the same time ,I add the member `alloc_count` of
struct mem_pool ,so that we can effective track
node alloc count,and adapt to the original interface `alloc_report`.

Signed-off-by: ZheNing Hu <adlternative@gmail.com>

Submitted-As: https://lore.kernel.org/git/pull.857.git.1612011569489.gitgitgadget@gmail.com