[Ada] More robust guard against cascaded errors with overlapping actuals

Pierre-Marie de Rodat derodat@adacore.com
Wed Jun 30 09:30:45 GMT 2021

Code cleanup, both to improve efficiency (when no error has been posted
for a subprogram call) and to avoid potential crashes (when an error has
been posted and the subprogram call parameters are likely to be
ill-formed as well).

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


	* sem_warn.adb (Warn_On_Overlapping_Actuals): Prevent cascaded
	errors once for the subprogram call, not for every pair of
	actual parameters.
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