[Ada] Initialize Current_Source_Unit

Pierre-Marie de Rodat derodat@adacore.com
Tue Nov 9 09:46:12 GMT 2021


Preprocessing may call Error_Msg though Current_Source_Unit is not
initialized. When gnat1 is compiled with gnatVa, this leads to a
Constraint_Error.

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

gcc/ada/

	* sinput.ads: Initialize Current_Source_Unit to No_Unit.
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