re PR c++/15507 (hang laying out union)

re PR c++/15507 (hang laying out union)

	PR c++/15507
	* class.c (layout_nonempty_base_or_field): Do not try to avoid
	layout conflicts for unions.

	PR c++/15542
	* typeck.c (build_x_unary_op): Instantiate template class
	specializations before looking for "operator &".

	PR c++/15427
	* typeck.c (complete_type): Layout non-dependent array types, even
	in templates.

	PR c++/15287
	* typeck.c (build_unary_op): Do not optimize "&x[y]" when in a
	template.

	PR c++/15507
	* g++.dg/inherit/union1.C: New test.

	PR c++/15542
	* g++.dg/template/addr1.C: New test.

	PR c++/15427
	* g++.dg/template/array5.C: New test.

	PR c++/15287
	* g++.dg/template/array6.C: New test.

From-SVN: r82144