Lazy init default thread allocator.
Lazy init default thread allocator.

mmicko/bx,bkaradzic/bx,septag/bx,fluffyfreak/bx,pigpigyyy/bx,0-wiz-0/bx,pigpigyyy/bx,septag/bx,fluffyfreak/bx,0-wiz-0/bx,MikePopoloski/bx,mmicko/bx,MikePopoloski/bx,bkaradzic/bx