* value.h (unop_promote, binop_promote): Add prototypes.

	* value.h (unop_promote, binop_promote): Add prototypes.
	* eval.c (unop_promote, binop_promote): New functions.
	* valarith.c (unop_result_type, binop_result_type): Remove.
	(value_binop): Call binop_promote or unop_promote.
	Inline remaining parts of binop_result_type.  Remove special
	code to truncate integer values for unsigned operations.
	(value_pos): Call unop_promote.  Inline remaining parts of
	unop_result_type.
	(value_neg, value_complement): Likewise.