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[Ada] Preliminary work for enlarging nodes

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Robert Dewar <dewar at adacore dot com>
Date: Mon, 19 Mar 2012 12:42:03 -0400
Subject: [Ada] Preliminary work for enlarging nodes

This patch provides a debug switch -gnatd.N that has the effect of
enlarging entities in the compiler by one node. The addition node
is not used, but this can be used to evaluate the impact of adding
a node. No test, since no external effect.

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

2012-03-19  Robert Dewar  <dewar@adacore.com>

	* atree.adb (Allocate_Initialize_Node): Use Num_Extension_Nodes
	* atree.ads (Num_Extension_Nodes): New variable
	* debug.adb: New debug flag -gnatd.N
	* gnat1drv.adb (Adjust_Global_Switches): Adjust
	Num_Extension_Nodes if -gnatd.N set

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