[ARM] Assembler and disassembler support Dot Product Extension

[Jiong Wang]

Hi,

   This patch add assembler and disassembler support for new Dot Product
   Extension.

   The support can be enabled through the new "+dotprod" extension.

   OK for master?

include/
2017-06-28  Jiong Wang  <jiong.wang@arm.com>

         * opcode/arm.h (FPU_NEON_EXT_DOTPROD): New macro.
         (FPU_ARCH_DOTPROD_NEON_VFP_ARMV8): New macro.

gas/
2017-06-28  Jiong Wang  <jiong.wang@arm.com>

         * config/tc-arm.c (fpu_neon_ext_dotprod): New variable.
         (neon_scalar_for_mul): Improve comments.
         (do_neon_dotproduct): New function to encode Dot Product instructions.
         (do_neon_dotproduct_s): Wrapper function for signed Dot Product
         instructions.
         (do_neon_dotproduct_u): Wrapper function for unsigned Dot Product
         instructions.
         (insns): New entries for vsdot and vudot.
         (arm_extensions): New entry for "dotprod".
         * doc/c-arm.texi: Document new "dotprod" extension.
         * testsuite/gas/arm/dotprod.s: New test source.
         * testsuite/gas/arm/dotprod-illegal.s: New test source.
         * testsuite/gas/arm/dotprod.d: New test.
         * testsuite/gas/arm/dotprod-thumb2.d: New test.
         * testsuite/gas/arm/dotprod-illegal.d: New test.
         * testsuite/gas/arm/dotprod-legacy-arch.d: New test.
         * testsuite/gas/arm/dotprod-illegal.l: New error file.
         * testsuite/gas/arm/dotprod-legacy-arch.l: New error file.

opcodes/
2017-06-28  Jiong Wang  <jiong.wang@arm.com>

         * arm-dis.c (coprocessor_opcodes): New entries for vsdot and vudot.

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