[ARM][gas] Add crypto-neon-fp-armv8.1 as an fpu option.

[Matthew Wahab]

Hello,

Support for ARMv8.1 Adv.SIMD was recently added to gas as architecture
extensions and as the -mfpu option neon-fp-armv8.1. This patch adds the -mfpu
option crypto-neon-fp-armv8.1 as neon-fp-armv8.1 with the crypto extension
enabled.

Tested for arm-none-linux-gnueabihf with check-binutils and check-gas. Checked
HTML documentation.

Ok for trunk?
Matthew

gas/
2015-06-19  Matthew Wahab  <matthew.wahab@arm.com>

	* config/tc-arm.c (arm_fpus): Add crypto-neon-fp-armv8.1.
	* doc/c-arm.texi (-mfpu=): Likewise.
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