[Ada] Add new attribute System_Allocator_Alignment

[Arnaud Charlet <charlet at adacore dot com>]

This attribute returns the alignment honored by malloc.
The following program should display this value:
with Ada.Text_IO; use Ada.Text_IO;

procedure Alloc_Algn is
begin
   Put_Line ("malloc alignment:"
             & Integer'Image (Standard'System_Allocator_Alignment));
end Alloc_Algn;

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

2011-08-29  Tristan Gingold  <gingold@adacore.com>

	* sem_attr.adb, exp_attr.adb: Add handling of
	Attribute_System_Allocator_Alignment
	* snames.ads-tmpl: Add Name_System_Allocator_Alignment and
	Attribute_System_Allocator_Alignment.
	* ttypes.ads, get_targ.ads: Add Get_System_Allocator_Alignment.
	* gcc-interface/targtyps.c, gcc-interface/utils2.c,
	gcc-interface/gigi.h: Renames get_target_default_allocator_alignment to
	get_target_system_allocator_alignment.

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