[Ada] Ada2020: AI12-0003 Specifying the standard storage pool

[Pierre-Marie de Rodat]

The standard storage pool can be specified in a Default_Storage_Pool
pragma or aspect. This new feature is documented in AI12-0003-1.

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

gcc/ada/

	* sem_prag.adb (Analyze_Pragma): Adding semantic support of
	Standard to Default_Storage_Pool.
	* freeze.adb (Freeze_Entity): If pragma Default_Storage_Pool
	applies and it is set to Standard then use the global pool as
	the associated storage pool of the access type.
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