[ARM][GAS] ARMv8.2 should enable ARMv8.1 NEON instructions.

[Matthew Wahab]

Hello,

GAS fails to recognize march=armv8.2-a as a superset of march=armv8.1-a
when assembling NEON instructions. This means that assembling something
like
----
vqrdmlah.s16 d0, d22, d22
----
with -march=armv8.2-a -mfpu=neon-fp-armv8 will trigger the message
----
Warning: this instruction implies use of ARMv8.1 AdvSIMD.
----
There is no such warning when armv8.1-a is set.

The patch corrects this, making -march=armv8.2-a -mfpu=neon-fp-armv8
enable the NEON intructions introduced with ARMv8.1-A.

Tested for arm-none-linux-gnueabihf with cross-compiled check-gas,
check-binutils and check-ld.

Ok for trunk?
Matthew

include/
2016-06-30  Matthew Wahab  <matthew.wahab@arm.com>

	* opcode/arm.h (ARM_ARCH_V8_2a): Add FPU_NEON_EXT_RDMA to the set
	of enabled FPU features.

gas/
2016-06-30  Matthew Wahab  <matthew.wahab@arm.com>

	* testsuite/gas/arm/armv8_2+rdma.d: New.
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