Summary:
@public
Contexts of nodes only hold a bit mask after we got rid of weak JNI refs.
We can simply store that data in a pointer-sized unsigned int.
Here, we replace all context heap allocations with usage of the node context (`void *`) as bitmask. We also add a couple of utility operators in order to keep the code comprehensible.
Reviewed By: fabiomassimo
Differential Revision: D14425742
fbshipit-source-id: f32c2184a1f09268c39dbb8cd09ac96517339674
1471be54e3