[Patch ARM] Support MVFR2 VFP Coprocessor register for ARMv8-A,*

[Ramana Radhakrishnan]

Hi

	This patch adds support mvfr2 control registers for armv8-a as this was 
missed from the original port to armv8-a (documented at G6.2.109 in 
(Issue B.a) of the ARM-ARM. This was discovered by an internal user of 
the GNU toolchain.

I'd like to backport this to the binutils 2.28 and binutils 2.29 release 
branch if possible (with suitable testing and basically checking 
removing the armv8-r parts).

Tristan - are you ok with the backports ?

Applied to trunk.

regards
Ramana



2017-07-04  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

         * gas/config/tc-arm.c (arm_regs): Add MVFR2.
         (do_vmrs): Constraint for MVFR2 and armv8.
         (do_vmsr): Likewise.
         * gas/testsuite/gas/arm/armv8-a+fp.d: Update.
         * gas/testsuite/gas/arm/armv8-ar+fp.s: Likewise.
         * gas/testsuite/gas/arm/armv8-r+fp.d: Likewise.
         * gas/testsuite/gas/arm/vfp-bad.s: Likewise.
         * gas/testsuite/gas/arm/vfp-bad.l: Likewise.
         * opcodes/arm-dis.c: Support MVFR2 in disassembly
         with vmrs and vmsr.