swift234

SILGen: Use ManagedValue to manage temporaries.
Steal IRGen's ManagedValue abstraction to handle the generation and consumption of rvalues. ManagedValue is a (Value, Cleanup?) pair that supports "forward"-ing ownership of a value and disabling its cleanup, which allows temporary values to be generated, retained, and either consumed by an ownership-taking operation such as a function call or aggregate initialization or released if unused.

Swift SVN r3293