[Ada] Make Gigi_Equivalent_Type idempotent

[Eric Botcazou]

This fixes a small regression in ASIS mode introduced by the new elaboration 
model for subprograms.  Tested on x86_64-suse-linux, applied on the mainline.


2016-06-06  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (Gigi_Equivalent_Type): Make sure equivalent
	types are present before returning them.  Remove final assertion.
	(gnat_to_gnu_entity) <E_Access_Protected_Subprogram_Type>: Adjust to
	above change.
	<E_Protected_Type>: Likewise.

-- 
Eric Botcazou
-------------- next part --------------
A non-text attachment was scrubbed...
Name: p.diff
Type: text/x-patch
Size: 2202 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20160606/0f752cfc/attachment.bin>