Blender Git Loki

Cycles: Fix guarded allocator issues on Windows

The issue was caused by static vectors allocating some internal
data using rebound element allocator for them, which was causing
access to a non-initialized statistics objects and was failing a
lot when switching Blender to a fully guarded allocation.

Additionally, we were not able to free that internal memory before
Blender exits, which was causing false-positive memory leak prints.

Now we're not using GuardedAllocator for those proxy containers.

Ideally this should be done as a GuardedAllocator::rebind, but
it didn't work for vector<bool> because it seems some internal
parts are converting bool to char32_t, which either makes it so
we can't use GuardedAllocator for those vectors or the compiler
get's confused when we're trying explicitly allow GuardedAllocator
for rebind<char32_t>.

This with current approach we should be fine for the release.