[Ada] Display Entity in debugging printouts

[Pierre-Marie de Rodat]

This patch fixes a bug in which procedures in Treepr such as pp would
fail to display the Entity or Associated_Node fields. This was because
of the shenanigans played with the Entity_Or_Associated_Node field (see
Sinfo.Utils).

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

gcc/ada/

	* treepr.adb (Print_Node): Display the Entity or Associated_Node
	fields if appropriate.
	* sinfo-utils.ads (F_Associated_Node, F_Entity): Remove. These
	are no longer needed.
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