(gen_frame_args_address): Add GDBARCH parameter; use it
	instead of current_gdbarch.
	(gen_frame_locals_address): Likewise.
	(gen_var_ref): Add GDBARCH parameter.  Update calls to
	gen_frame_args_address and gen_frame_locals_address.  Use
	pointer type from gdbarch.
	(gen_usual_unary): Add EXP parameter.  Use integer type
	from exp->gdbarch.
	(gen_usual_arithmetic): Likewise.
	(gen_integral_promotions): Likewise.
	(gen_add, gen_sub): Remove.
	(gen_ptradd, gen_ptrsub, gen_ptrdiff): New functions.
	(gen_logical_not): Use passed-in boolean result type
	instead of builtin_type_int.
	(gen_complement): Do not call gen_usual_unary or
	gen_integral_promotions.
	(gen_struct_ref): Call require_rvalue instead of gen_usual_unary.
	(gen_repeat): Add EXP parameter.  Update call to gen_expr.
	Use builtin_type_int32 as internal range type.
	(gen_sizeof): Add EXP and SIZE_TYPE parameters.  Use SIZE_TYPE
	as result type.  Update call to gen_expr.
	(gen_expr): Add EXP parameter.  Update calls to gen_expr,
	gen_repeat, gen_var_ref, gen_usual_unary, gen_usual_arithmetic,
	and gen_integral_promotions.  Call gen_ptradd, gen_ptrsub,
	gen_ptrdiff, or gen_binop instead of gen_add or gen_sub.
	Use exp->gdbarch instead of current_gdbarch.
	Call language_bool_type to determine result type of UNOP_LOGICAL_NOT.