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[Ada] optimize installation of access checks for access params

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Hristian Kirtchev <kirtchev at adacore dot com>
Date: Tue, 4 Sep 2007 10:11:35 +0200
Subject: [Ada] optimize installation of access checks for access params

Tested on i686-linux, committed on trunk

This patch optimizes the installation of access checks for access
parameters. If a reference to an access formal appears in the declarative
part of a subprogram body, it is sufficent to generate only one access
check and disable the rest thoughout the handled statements.

2007-08-31  Hristian Kirtchev  <kirtchev@adacore.com>

	* checks.adb (In_Declarative_Region_Of_Subprogram_Body): New routine.
	(Mark_Non_Null): If the node for which we just generated an access check
	is a reference to an *in* parameter and the reference appears in the
	declarative part of a subprogram body, mark the node as known non null.

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