[Ada] Plug small loophole in implementation of AI12-0100

[Pierre-Marie de Rodat]

The qualified expressions present in allocators use a specific circuitry
during type resolution and, therefore, escape the new static predicate
check required by AI12-0100 and present in Resolve_Qualified_Expression.

This removes the specific circuitry, as well as makes small adjustments
to Resolve_Qualified_Expression needed in allocator contexts.

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

2020-06-19  Eric Botcazou  <ebotcazou@adacore.com>

gcc/ada/

	* sem_res.adb (Resolve_Allocator): Call Resolve_Qualified_Expression
	on the qualified expression, if any, instead of doing an incomplete
	type resolution manually.
	(Resolve_Qualified_Expression): Apply predicate check to operand.
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