Fix segfault on anonymous structures with -fdump-ada-spec

[Eric Botcazou]

This is a trivial patch to fix a segfault on anonymous structures with the 
special -fdump-ada-spec switch.  It also contains a fixlet for enumeral types.

Bootstrapped/regtested on x86_64-suse-linux, applied on the mainline.


2017-07-29  Eric Botcazou  <ebotcazou@adacore.com>

c-family/
	* c-ada-spec.c (dump_generic_ada_node): Take into account signedness
	for enumeral types.
	(print_ada_declaration): Add missing guard for record types.


2017-07-29  Eric Botcazou  <ebotcazou@adacore.com>

	* c-c++-common/dump-ada-spec-7.c: New test.

-- 
Eric Botcazou
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