C++ PATCH to reduce use of [cd]tor_label

[Jason Merrill]

ctor_label is obsolete in the V3 ABI, as it was used to control the special
return semantics of constructors, which they no longer have.

dtor_label is still useful, but now that we have DECL_DESTRUCTOR_P, not the
preferred way of determining whether the current function is a destructor.

Tested i686-pc-linux-gnu.

2001-12-12  Jason Merrill  <jason@redhat.com>

	* cp-tree.h (struct cp_language_function): Remove x_ctor_label.
	(ctor_label): Remove.
	* semantics.c (finish_return_stmt): Lose ctor_label support.
	* decl.c (finish_constructor_body, mark_lang_function): Likewise.
	* typeck.c (check_return_expr): Check DECL_DESTRUCTOR_P, not 
	dtor_label.

	* call.c (build_new_method_call): Let resolves_to_fixed_type_p
	check for [cd]tors.
	* class.c (fixed_type_or_null, case INDIRECT_REF): Fix.

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