[AArch64] Binutils/gas/ld port for ARM's new 64-bit architecture, AArch64 [1/6] Toplevel configury changes

[Yufeng Zhang]

This patch adds the top level configury changes for the AArch64 target 
support.


Yufeng


ChangeLog
2012-07-30  Ian Bolton  <ian.bolton@arm.com>
             Jim MacArthur  <jim.macarthur@arm.com>
             Marcus Shawcroft  <marcus.shawcroft@arm.com>
             Nigel Stephens  <nigel.stephens@arm.com>
             Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
             Richard Earnshaw  <rearnsha@arm.com>
             Sofiane Naci  <sofiane.naci@arm.com>
             Tejas Belagod  <tejas.belagod@arm.com>
             Yufeng Zhang  <yufeng.zhang@arm.com>

         * configure.ac: Add AArch64.
         * configure: Regenerate.
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