re PR c++/7931 (The compiler ices on some legal code)

re PR c++/7931 (The compiler ices on some legal code)

 	PR c++/7931
	* pt.c (for_each_template_parm_r): Handle BASELINKs.

	PR c++/7754
	* decl2.c (finish_anon_union): Do not expand anonymous unions when
	procesing template functions.
	* pt.c (tsubst_decl, case VAR_DECL): Try to complete the variable
	type. Call layout_decl.
	(tsubst_expr, case DECL_STMT): Handle anonymous unions.

	PR c++/7931
	* g++.dg/template/ptrmem3.C: New test.

	PR c++/7754
	* g++.dg/template/union1.C: New test.

From-SVN: r57800