swift234

more tidying:
 - Strength reduce the interface to LogicalPathComponent::getMaterialized
   to now just return a SILValue for the address.  The full "Materialize"
   structure hasn't been needed since MaterializeExpr got removed.
 - Move 'struct Materialize' out of SILGen.h into SILGenLValues.cpp now
   that it is only used for logical property materialization.
 - Drop the dead 'loc' argument on DeallocStackCleanup.  The location is
   already specified when the cleanup is emitted.


Swift SVN r12827