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[Ada] Fix stack usage for windows-64

From: Arnaud Charlet <charlet at adacore dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Tristan Gingold <gingold at adacore dot com>
Date: Tue, 27 Sep 2011 05:48:29 -0400
Subject: [Ada] Fix stack usage for windows-64

According to some experiments, the guard area size is 16KB on Windows 64.
(Stack size must be a multiple of the allocation granularity - 64KB - to
 get better guard size estimation).
No OS independant testcase.

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

2011-09-27  Tristan Gingold  <gingold@adacore.com>

	* s-tassta.adb (Task_Wrapper): Increase Guard_Page_Size value for
	windows 64.

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