[Ada] Accept absolute address clause for array of UNC nominal subtype

[Eric Botcazou]

This changes the compiler to accept again absolute address clause for aliased 
array of unconstrained nominal subtype, instead of erroring out in this case.

Tested on x86_64-suse-linux, applied on the mainline.


2020-09-12  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Variable>: Only give
	a warning for the overlay of an aliased array with an unconstrained
	nominal subtype if the address is absolute.

-- 
Eric Botcazou
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