[Ada] Fix internal error on chain of constants with -gnatc

[Eric Botcazou]

This is a rather obscure case not really worth commenting. :-)

Tested on x86-64/Linux, applied on the mainline.


2020-11-11  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Constant>: In case
	the constant is not being defined, get the expression in type
	annotation mode only if its type is elementary.

-- 
Eric Botcazou
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