swift234

SILGen: Implement address-only assignment.
Refactor the assignment implementation a bit so that the FullExpr scope for the assignment lasts long enough that we can pass the ManagedValue from the right-hand side down into the visitor for the left-hand side. A physical assignment of an address-only temporary can take the temporary, but a logical assignment involving a setter call does not, so hand the ManagedValue down through emitAssignToLValue and LValue LogicalComponent::storeRValue so forward-ing can do its thing where appropriate.

Swift SVN r3557