[PATCH][GAS][ARM] Add Dot Product Extension as mandatory feature on Armv8.4-A [Patch (2/3)]

[Tamar Christina]

Hi All,

"+dotprod" is mandatory since Armv8.4-A.  This patch adds the support in GAS.

Checked with check-gas on arm-none-eabi and armeb-none-eabi, no regressions.

Ok for master?

Ps. I do not have commit access so if OK can someone apply for me?

Thanks,
Tamar

include/
2017-11-08  Jiong Wang  <jiong.wang@arm.com>

        * opcode/arm.h (ARM_AEXT2_V8_4A): Include Dot Product feature.

gas/
2017-11-08  Jiong Wang  <jiong.wang@arm.com>
	    Tamar Christina <tamar.christina@arm.com>

	* config/tc-arm.c (arm_extensions):
	Add FPU_ARCH_DOTPROD_NEON_VFP_ARMV8.
        * testsuite/gas/arm/dotprod-mandatory.d: New test.

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