[Ada] Ada2020 AI12-0282: Shared variable control aspects in generics

[Pierre-Marie de Rodat]

This patch refines the checks and the corresponding error messsages on
the legality of instantiations where some formal objects and their
corresponding actuals may carry Atomic, Atonic_Components,  Volatile,
Volatile_Components, Independent, or Independent_Components aspect
specifications. The legality rules require exact match between formal
and actual for the first four aspects, but not for the last two.  For
Atomic_Components and Volatile_Components we also check whether the
actual is of an array type with the corresponding: aspect on its
component type.

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

2020-06-09  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* sem_ch12.adb (Check_Shared_Variable_Control_Aspects): Require
	exact match between formal and actual for aspects Atomic,
	Atomic_Component, Volatile, and Volatile_Components.
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