This name makes it clear that the function has not yet been deleted and also
contrasts with the past tense used in the API notifyAddedOrModifiedFunction to
show that said function has already added/modified the function.
Generally in the SIL/SILOptimizer libraries we have been putting kinds in the
swift namespace, not a nested scope in a type in swift (see ValueKind as an
example of this).
Simple utility for transfersing functions such that parent scopes are always
visited before noescape closures.
Note that recursion is disallowed. Noescape closures are not reentrant.
Record noescape closure scopes. This allows passes to process closures and their
parent scopes in a controlled order. AccessEnforcementSelection needs this
because it needs to process parent scopes before selecting enforcement within
noescape closures.
Eventually this could be used by the PassManager so that
AccessEnforcementSelection can go back to being a function transform.
