[Ada] Avoid unhelpful dead code warnings

Pierre-Marie de Rodat derodat@adacore.com
Tue Jun 15 10:20:52 GMT 2021

We have an existing mechanism for suppressing dead code warning messages
in the case of an if-statement within an instance of a generic where the
value of the condition is known statically. Generalize this approach to
also handle case statements.

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


	* exp_util.adb (Kill_Dead_Code): Generalize the existing
	handling of if statements to handle case statements similarly.
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