[Patch, Aarch64]: Handle return address via. frame pointer

[Venkataramanan Kumar]

Hi Maintainers,

This patch adds supports to handle return address via. frame pointer.

gcc/ChangeLog
---------------------

2013-07-28  Venkataramanan Kumar  <venkataramanan.kumar@linaro.org>

       *  config/aarch64/aarch64.c (aarch64_return_addr): Handle returning
          address from a frame.


Regression tested with aarch64-none-elf with V8 foundation model.

regards,
Venkat.
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