Correct conversion/overflow behavior.

	Correct conversion/overflow behavior.
	* cvt.c (ignore_overflows): Move here from typeck.c.
	(ocp_convert): Use it.
	(cp_fold_convert): Use it.  Don't call rvalue.
	* typeck.c (build_static_cast_1): Don't use it.  Do call rvalue.
	* error.c (location_of): Handle expressions, too.
	* class.c (check_bitfield_decl): Set input_location around call to
	cxx_constant_value.
	* semantics.c (cxx_eval_outermost_constant_expr): Don't
	print the expression if it already had TREE_OVERFLOW set.
	(reduced_constant_expression_p): Check TREE_OVERFLOW_P for C++98, too.
	(verify_constant): Allow overflow with a permerror if we're
	enforcing.
	(cxx_eval_outermost_constant_expr): Use verify_constant.
	(adjust_temp_type): Use cp_fold_convert.
	* decl.c (build_enumerator): Don't call constant_expression_warning.
	* decl2.c (grokbitfield): Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@166453 138bc75d-0d04-0410-961f-82ee72b054a4