[Ada] Fix oversight in Delayed_Aspect_Present predicate

[Pierre-Marie de Rodat]

The predicate returns true only if an aspect requiring delaying like
Alignment or Address is the first aspect in the list.  The change
also contains a small consistency fix for Freeze_Object_Declaration.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* sem_ch3.adb (Delayed_Aspect_Present): Fix oversight in loop.
	* freeze.adb (Freeze_Object_Declaration): Use Declaration_Node
	instead of Parent for the sake of consistency.
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