[Ada] Fix minor issue with unconstrained packed arrays

[Eric Botcazou]

The compiler allocates the non-packed size for a function returning a 
parameter of an unconstrained packed array type.

Tested on x86_64-suse-linux, applied on the mainline and 9 branch.


2019-05-28  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (lvalue_required_for_attribute_p): Return 0
	for 'Size too.
	(Identifier_to_gnu): Use the actual subtype for a reference to a
	packed array in a return statement.
	(Attribute_to_gnu) <Attr_Size>: Do not strip VIEW_CONVERT_EXPRs from
	the prefix in every case.

-- 
Eric Botcazou
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