> 1. `ArrayAllocatorMallocLimit` is removed. The test cases that tested it also
> are removed.
> 2. `AllocArrayAllocator` instances are replaced with `MallocArrayAllocator`.
> 3. The signature of `CHeapBitMap::free(ptr, size)` is kept as it is, since it
> is called in this way from `GrowableBitMa
> Remove abstraction that is a holdover from Solaris. Direct usages of
> `MmapArrayAllocator` have been switched to normal `malloc`. The justification
> is that none of the code paths are called from signal handlers, so using
> `mmap` directly does not make sense and is potentially slower than g
