[Ada] Fix latent issues with thin pointers

Eric Botcazou ebotcazou@adacore.com
Mon Jan 20 10:59:00 GMT 2014

This fixes latent issues with thin pointers, which get exposed with -gnatd6.

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

2014-01-20  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Robustify tests
	for aliased objects with an unconstrained nominal subtype.
	* gcc-interface/trans.c (Call_to_gnu): Likewise.
	(gnat_to_gnu) <case N_Op_Not>: Robustify test for private type.
	<case N_Op_Minus>: Remove useless code.
	(Exception_Handler_to_gnu_zcx): Minor tweaks.

Eric Botcazou
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