[Ada] Fix handling of incomplete types with -fdump-ada-spec (2/2)

[Eric Botcazou]

This extends the previous change to "opaque" types, i.e. types that are still 
incomplete at the end of the translation unit.

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


2018-02-28  Eric Botcazou  <ebotcazou@adacore.com>

c-family/
	* c-ada-spec.c (dump_ada_node) <POINTER_TYPE>: Do not use generic
	address for incomplete structures.
	(dump_forward_type): Do not bail out for incomplete structures.
	(dump_ada_declaration): Do not special-case incomplete structures
	for subtypes.  Dump them as null records for types.


2018-02-28  Eric Botcazou  <ebotcazou@adacore.com>

	* c-c++-common/dump-ada-spec-11.c: New test.

-- 
Eric Botcazou
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