[LLVMdev] Incredible effects of extending AtomicSDNode::Ops

[Tim Northover]

Hi Artyom,

> We've just depleted our imagination on how this can at all be
> possible, so we welcome your advice.

I suspect it's that SDNodes are allocated using a BumpPtrAllocator
(sort of) with a maximum size of sizeof(LargestSDNode). Changing that
typedef to AtomicSDNode with your additions makes all the tests pass
again for me.

Cheers.

Tim.