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[Ada] Improve GC and tree marking

From: Andrew Pinski <pinskia at physics dot uc dot edu>
To: "gcc-patches at gcc dot gnu dot org Patches" <gcc-patches at gcc dot gnu dot org>
Cc: Richard Kenner <kenner at vlsi1 dot ultra dot nyu dot edu>
Date: Fri, 29 Oct 2004 18:13:08 -0400
Subject: [Ada] Improve GC and tree marking

This fixes PR 17986 which is caused by a stack overflow in the GC
marking as Windows has a very low stack size.  It should also speed
up the Ada compiler.  This is already done in almost all other
front-ends (except for fortran which I will send a patch for, it was
preapproved by the fortran maintainer already).

OK? Bootstrapped on powerpc-darwin (up till a get a link error which
is a different bug and already filed).

Thanks,
Andrew Pinski

ChangeLog:

	* ada-tree.h (lang_tree_node): Set chain_next to be the chain of the
	tree.

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