Redesign LifetimeDependenceScopeFixup to handle accessors.

Handle all combinations of nested dependence scopes: access scopes, coroutines,
and borrow scopes.

This is required to enforce ~Escapable _read accessors and unsafeAddress addressors.

Fixes rdar://140424699 (Invalid SIL is generated by some passes for certain
@Lifetime annotations)

Author: atrick