When a NoncopyableGenericsMismatch happens between the compiler and
stdlib, allow the compiler to rebuild the stdlib from its interface
instead of exiting with an error.
Workaround for rdar://119950540 when dealing with invertible protocols.
This should be sound because "its an invariant that subst() on a
conformance returns the same thing as a global lookup with subst() of
the conforming type, assuming you don't have overlapping conformances."
