re PR c++/15083 (spurious "statement has no effect" warning)

re PR c++/15083 (spurious "statement has no effect" warning)

	PR c++/15083
	* decl2.c (delete_sanity): Set TREE_SIDE_EFFECTS on a DELETE_EXPR,
	even in a templat.e
	* init.c (build_new): Likewise.

	PR c++/15640
	* name-lookup.c (arg_assoc): Robustify.

	PR c++/15471
	* typeck.c (unary_complex_lvalue): Use context_for_name_lookup
	when determining the scope to use for a pointer to member.

	PR c++/15083
	* g++.dg/warn/noeffect5.C: New test.

	PR c++/15471
	* g++.dg/expr/ptrmem4.C: New test.

	PR c++/15640
	* g++.dg/template/operator3.C: New test.

From-SVN: r82391