[Ada] Disable assertion in ASIS mode

[Eric Botcazou]

The assertion is too strong in ASIS mode, where all the types aren't laid out.

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


2013-05-26  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c: (gnat_to_gnu_entity): In ASIS mode, do not
	check that access types have a set size.


-- 
Eric Botcazou
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