[Ada] Relax restrictions on volatile components

[Eric Botcazou]

GNAT has historically enforced strong restrictions on volatile components, but 
this is no basis for that in the RM.

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


2017-05-22  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_field): Do not enforce strict
	alignment for simple volatile fields and remove associated errors.


2017-05-22  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/specs/volatile1.ads: Remove obsolete errors.
	* gnat.dg/specs/clause_on_volatile.ads: Likewise.

-- 
Eric Botcazou
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