Summary:
Does three things:
1. Fix order of arguments to `updEntry` to update the existing entry, instead of replacing it with 2*new.
2. Subtract nested allocations from parent.
3. Call setAllocationCounter after recording profiling data, so profiling overhead doesn't count towards the parent or the allocation limit.
Reviewed By: simonmar
Differential Revision: D3235413
fbshipit-source-id: a9f287399516fc90600b15a1524592f9c3b0674b
