[Ada] Ada 202x AI12-0192 "requires late initialization"

[Pierre-Marie de Rodat]

Working on this AI it appeared that GNAT wasn't implementing the Ada
2012 notion of "require late initialization", so plug this hole and
implement the new rule from AI12-0192 at the same time.

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

2020-06-10  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* exp_ch3.adb (Build_Init_Statements): Implement the notion of
	"require late initialization".
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