ada: Fix fallout of change in parameter passing out of aliasing considerations

ada: Fix fallout of change in parameter passing out of aliasing considerations

If an actual parameter that is a type conversion is passed by reference but
not addressable, the temporary that is created and whose address is passed
instead may need to be in the target type of the conversion to fulfill the
requirements of strict aliasing.

gcc/ada/ChangeLog:

	* gcc-interface/trans.cc (Call_to_gnu): If the formal is passed by
	reference and the actual is a type conversion but not addressable,
	create the temporary in the target type of the conversion if this
	is needed to enforce strict aliasing.