[Ada] Proof of runtime units for integer exponentiation (checks off)

Pierre-Marie de Rodat derodat@adacore.com
Wed Jan 5 11:33:31 GMT 2022

This proves the generic unit System.Exponn instanciated for Integer,
Long_Long_Integer and Long_Long_Long_Integer. In order to be able to add
a suitable contract to the generic function, it is changed into a
generic package which contains the function. Instantiations are adapted.

GNATprove is called with switch --level=2.

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


	* libgnat/s-exnint.ads: Mark in SPARK. Adapt to change to
	* libgnat/s-exnlli.ads: Likewise.
	* libgnat/s-exnllli.ads: Likewise.
	* libgnat/s-exponn.adb: Add lemmas and ghost code. Secial case
	value zero as Left or Right to simplify proof.
	* libgnat/s-exponn.ads: Transform the generic function into a
	generic package with a function inside. Add a functional
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