[Ada] Simplify expansion of array equality

[Pierre-Marie de Rodat]

Cleanup related to expansion of dispatching equality for GNATprove.
Semantics is unaffected

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

gcc/ada/

	* exp_ch4.adb (Test_Empty_Arrays): Simplify with Evolve_Or_Else;
	remove unnecessary call to Relocate_Node.
	(Test_Lengths_Correspond): Likewise.
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