[Ada] Spurious error on Predicate_Failure aspect

[Pierre-Marie de Rodat]

GNAT would in some cases not resolve a Predicate_Failure aspect properly
and generate spurious errors of the form:

  cannot find unique type for raise expression

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

gcc/ada/

	* sem_ch13.adb (Check_Aspect_At_End_Of_Declarations): Add proper
	handling of Aspect_Predicate_Failure, consistent with
	Check_Aspect_At_Freeze_Point.
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