[Ada] Pragma Atomic wrongly rejected on composite component

[Eric Botcazou]

The compiler wrongly rejects a pragma Atomic on a component of a record whose 
type is composite, but it accepts the pragma on a variable of the same type.

Tested on x86_64-suse-linux, applied on the mainline and 7 branch.


2017-09-09  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (promote_object_alignment): New function taken
	from...
	(gnat_to_gnu_entity) <E_Variable>: ...here.  Invoke it.
	(gnat_to_gnu_field): If the field is Atomic or VFA, invoke it and
	create a padding type on success before doing the atomic check.


2017-09-09  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/specs/atomic3.ads: New test.

-- 
Eric Botcazou
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