sem_ch4.adb (Has_Fixed_Op): New predicate in Check_Arithmetic_Pair...

sem_ch4.adb (Has_Fixed_Op): New predicate in Check_Arithmetic_Pair...

	* sem_ch4.adb (Has_Fixed_Op): New predicate in Check_Arithmetic_Pair,
	to determine whether one of the operands is a fixed-point type for
	which a user-defined multiplication or division operation might be
	defined.

	* sem_res.adb (Valid_Conversion): The legality rules for conversions
	of access types are symmetric in Ada 2005: either designated type can
	be unconstrained.

From-SVN: r92849