Fix malloc_info missing large allocs.

Also change the names of some of the functions to make it very obvious
that the functions being called are in je code.

Write new test to make sure mallinfo and malloc_info match.

Bug: 131864803

Test: New unit tests pass (along with all other bionic unit tests).
Change-Id: I26eda7e64f57a8c56cc8d70e3ed6a29dcb87f630