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[Ada] Improve nnd debugging hooks

From: Pierre-Marie de Rodat <derodat at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Bob Duff <duff at adacore dot com>
Date: Mon, 9 Oct 2017 11:51:27 -0400
Subject: [Ada] Improve nnd debugging hooks
Authentication-results: sourceware.org; auth=none

This patch improves and simplifies the debugging hooks.  Now you just have to
break on nnd to find all "interesting" creations/modifications of node ids.  No
change in functionality; no test available.

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

2017-10-09  Bob Duff  <duff@adacore.com>

	* atree.adb: Make nnd apply to everything "interesting", including
	Rewrite.  Remove rrd.

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