[Ada] Ada_2020: shared variable control aspects on formal derived types

[Pierre-Marie de Rodat]

This completes the implementation of AI12-0282, which allows variable
control aspects to apply to formal types. This patch extends the
implementation to handle properly formal derived types.

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

2020-06-08  Ed Schonberg  <schonberg@adacore.com>

gcc/ada/

	* par-ch12.adb (P_Formal_Derived_Type_Definition): Handle
	properly formal derived types that include aspect
	specifications, so that the "with" keyword appears twice in the
	formal type declaration.
	* sem_ch13.adb (Has_Generic_Parent): Return true if the type
	itself is a generic formal.
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