[PATCH][gas][AArch64] Add support for Cortex-A72

[Matthew Wahab]

Hello,

The Cortex-A72 is an ARMv8 core with the same architectural features as 
the Cortex-A57. This patch adds support to GAS for the command line 
option -mcpu=cortex-a72 with the same effect as the -mcpu=cortex-a57 
option, only the name being different.

Tested check-gas with aarch64-none-linux-gnu, no failures. Tested the 
new cpu option from the command line.
	
Ok for trunk?
Matthew

gas/
2015-02-04  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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