d: internal compiler error: in convert_move, at expr.cc:227

d: internal compiler error: in convert_move, at expr.cc:227

This was caused by a forward reference of a nested struct changing the
TYPE_MODE of its enclosing struct type to be incorrectly inferred as an
integer mode.  Fixed by setting TREE_ADDRESSABLE early, and moving the
mode setting and propagation to finish_aggregate_mode and
finish_aggregate_type respectively, rather than at the end of the
visitor method for TypeStruct.

	PR d/125089

gcc/d/ChangeLog:

	* types.cc (finish_aggregate_mode): Explicitly set TYPE_MODE of
	non-POD types here.
	(finish_aggregate_type): Propagate TREE_ADDRESSABLE to all variants.
	(TypeVisitor::visit (TypeStruct *)): Set TREE_ADDRESSABLE before
	visiting struct members.

gcc/testsuite/ChangeLog:

	* gdc.dg/pr125089.d: New test.