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

[Matthew Wahab]

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

The trunk change is here: 
https://sourceware.org/ml/binutils/2015-02/msg00026.html.
The commit log is here: 
https://sourceware.org/ml/binutils-cvs/2015-02/msg00088.html

Tested check-gas with arm-none-linux-gnueabihf, no failures.

Ok for the branch?
Matthew

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

	* config/tc-arm.c: Add support for Cortex-A72.
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