[Ada] Add support for folding more and/or expressions

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

In particular we now recognize expressions of the form

  xxx and False
  xxx or True

when xxx has no side effect.

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


	* sem_eval.adb (Eval_Logical_Op, Test_Expression_Is_Foldable):
	Add support for folding more "and"/"or" expressions.
	* exp_util.adb (Side_Effect_Free): Fix handling of membership
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