This way we solve possible issues caused by regular allocator not being aware of
some classes preferring 16 bytes alignment needed for SSE to work properly. This
caused random crashes during rendering.
Now we always use aligned allocation in GuardedAllocator which shouldn't be any
measurable performance impact and the code is only used by developers after
defining special symbol, so there is no impact on release builds at all.
It's actually a bad level call, but it's inside ifdef block and disabled by
default and only intended to be used for development purposes.
Main idea of this change is to combine statistics coming from Cycles and
Blender during scene synchronization step, to see if further changes are
actually reducing memory footprint.
The commit implements a guarded allocator which can be used by STL classes
such as vectors, maps and so on. This allocator will keep track of current
and peak memory usage which then can be queried.
New code for allocator is only active when building Cycles with debug flag
(WITH_CYCLES_DEBUG) and doesn't distort regular builds too much.
Additionally now we're using own subclass of std::vector which allows us
to implement shrink_to_fit() method which would ensure capacity of the
vector is as big as it should be (without this making vector smaller will
still use all previous memory allocated).
