[ARM] Add FP16 feature extension for ARMv8.2 architecture

[Jiong Wang]

This patch adds FP16 feature extension for ARMv8.2 architecture.

You can enable fp16 support by commands like:
     
        -march=armv8.2-a+fp16 -mfpu=neon-fp-armv8

OK for trunk?


2016-02-16  Matthew Wahab  <matthew.wahab@arm.com>
             Jiong Wang  <jiong.wang@arm.com>


include/
   * opcode/arm.h (ARM_EXT2_FP16_INSN): New.

gas/
   * config/tc-arm.c (arm_ext_fp16): New.
   (arm_extensions): New entry for "fp16".

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