[PATCH 2/4][ARM Intrinsics] Add missing float16x8_t type

[Alan Lawrence]

This defines arm_neon.h's float16x8_t type, although no intrinsics yet (see next 
patch). Adding V8HFmode does mean programmers can define a GCC vector of same 
size themselves.

gcc/ChangeLog:

     * config/arm/arm.h (VALID_NEON_QREG_MODE): Add V8HFmode.

     * config/arm/arm.c (arm_vector_mode_supported_p): Support V8HFmode.

     * config/arm/arm-builtins.c (v8hf_UP): New.
     (arm_init_simd_builtin_types): Initialise Float16x8_t.

     * config/arm/arm-simd-builtin-types.def (Float16x8_t): New.

     * config/arm/arm_neon.h (float16x8_t): New typedef.

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