[AArch64][gas][2.25] Backport support for Cortex-A72

[Matthew Wahab]

This patch backports to binutils-2.25 support for the Cortex-A72 in the 
AArch64 backend.

The trunk change is here: 
https://sourceware.org/ml/binutils/2015-02/msg00025.html.
The commit log is here: 
https://sourceware.org/ml/binutils-cvs/2015-02/msg00031.html.

Tested with check-gas for aarch64-none-linux-gnu, no failures.

Ok for the branch?	
Matthew

gas/
2015-02-11  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-aarch64.c: Add support for Cortex-A72.
	* doc/c-aarch64.texi (-mcpu=): Add "cortex-a72".
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