This is just an initial prototype for people to play with. It is as always
behind the -enable-experimental-move-only flag.
NOTE: In this PR I implemented this only for 'local let' like things (local
lets/params). I did not implement in this PR support for local var and haven't
done anything with class ivars or globals.
rdar://83957028
Straighforward API to build pruned liveness from a single SSA value.
This 3-line function allows PrunedLiveness to be used anywhere
ValueLifetimeAnalysis was used in OSSA form. Aside from simplicity and
efficiency, the difference is that this composes with other utilities
that only care about PrunedLiveBlocks, PrunedLiveness, or
PrunesLivenessBounary independent of how those data structures were generated.
Simple wrapper to compute the boundary of PrunedLiveness.
Pervasively useful utility for working with OSSA reference lifetimes
and borrow scopes.
This can also replace the implementation in
CanonicalOSSALifetime. This will greatly simplify that utility's
logic, preparing it to handle diagnostics (like move-only SILValue
checking) and other features.
