[patch] ARM half-precision support

[Catherine Moore]

This patch adds the binutils support for arm half-precision instructions.  Does this look okay to 
install?  I will post the additions to the gas testsuite separately.  Thanks,
Catherine

         gas/
         * config/tc-arm.c (neon_type_mask): Renumber.
         (type_chk_of_el_type): Handle F_F16.
         (neon_cvt_flavour): Recognize half-precision conversions.
         (do_neon_cvt): New shapes NS_QD and NS_DQ.  Encode half-precision
         conversions.
         (do_neon_cvtt): Encode the T bit.
         (asm_opcode_insns): vcvt, vcvtt support.
         (arm_option_cpu_value): Add neon-fp16 support.

         include/
         * opcode/arm.h (FPU_NEON_FP16): New.
         (FPU_ARCH_NEON_FP16): New.
         * elf/arm.h (Tag_ABI_FP_16bit_format): Define.

         opcodes/
         * arm-dis.c (coprocessor_opcodes): Add half-precision vcvt
         instructions.
         (neon_opcodes): Likewise.
         (print_insn_coprocessor): Print 't' or 'b' for
         vcvt instructions.

         binutils/
         * readelf.c (arm_attr_tag_ABI_FP_16bit_format): New.
         (arm_attr_tag_VFP_HP_extension): New.
         (arm_attr_public_tag arm_attr_public_tags): Support new
         attributes.

         bfd/
         * elf32-arm.c (elf32_arm_merge_eabi_attributes): Merge
         half-precision attributes.
         (elf32_arm_copy_one_eabi_other_attribute): New.
         (elf32_arm_copy_other_attribute_list): New.
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