[PATCH][AARCH64][2.20] Backporting "End frame record chain correctly"

[Renlin Li]

Hi all,

This is a backport for branch/release/2.20/master of the patch "End 
frame record chain correctly"  posted in: 
https://sourceware.org/ml/libc-alpha/2014-11/msg00167.html

aarch64-none-linux-gnu target has been tested on the model. No new issues.

Okay to commit?

ChangeLog:

2014-11-10  Renlin Li <Renlin.Li@arm.com>

     [BZ #17555]
     * sysdeps/aarch64/start.S (_start): Delete x29 overwritten assignment.
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