[Ada] Guard against illegal items in Global but not Depends

Pierre-Marie de Rodat derodat@adacore.com
Tue Nov 9 09:45:38 GMT 2021

An illegal item appearing in the Global contract but missing from the
Depends contract was crashing the compiler.

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


	* sem_prag.adb (Check_Usage): Guard against calling Usage_Error
	with illegal Item_Id. The intention to do this was already
	described in the comment but not implemented.
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