This utility attempts to delete dead closures with a set of
post-dominating releases using the infrastructure from
getFinalReleasesForValue.
It currently only will eliminate closures that only have retain, release
uses and a final post-dominating release set.
The reason why we need the final post-dominating release set is so that
we can release any captured variables at the points where we would have
deallocated the release. This is b/c captured variables are passed in at
+1 to partial apply.
Swift SVN r25050
I am going to use this in closure specialization to remove dead closures. We
should refactor the SILCombine dead closure removal to use this code path as
well.
Additionally, we should change the valueMayBeCaptured infrastructure to take a
struct like we do in LLVM so we can ignore casts and other things like that
additionally by injecting the logic to do so via the struct.
But that is for another day.
Swift SVN r25007
llvm::Optional lives in "llvm/ADT/Optional.h". Like Clang, we can get
Optional in the 'swift' namespace by including "swift/Basic/LLVM.h".
We're now fully switched over to llvm::Optional!
Swift SVN r22477
This is because I need them in ARCAnalysis.cpp and from a modeling
perspective it is no longer just going to be used just in AA since they
are of larger functionality.
Swift SVN r16297
