[Ada] Improve error message for ghost in predicate

Pierre-Marie de Rodat derodat@adacore.com
Wed Apr 28 09:41:39 GMT 2021

It may be surprising to users that a ghost entity is not allowed to
appear in a predicate, which is a kind of assertion. Explain this in a
continuation message, as well as the possible fixes.

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


	* ghost.adb (Check_Ghost_Context): Add continuation message when
	in predicate.
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