d: Merge upstream dmd 529110f66, druntime 148608b7.

D front-end changes:

    - Import latest bug fixes to mainline.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 529110f66.
	* decl.cc (DeclVisitor::visit (TupleDeclaration *)): Update for new
	front-end interface.
	* types.cc (layout_aggregate_members): Likewise.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime 148608b7.