It looks like the only thing that fails is the linkage computation
for the dynamic replacement key of class methods. Even though
methods have hidden linkage to prevent them from being directly
referenced from outside a resilient module, we need to ensure
the dynamic replacement key is visible.
Fixes <rdar://problem/58457716>.
To correctly call designated super class initializers the designated
intializer (and not the allocator) is dynamically replaceable.
Convenience allocators are dynamically replaceable as before.
