[PATCH] [ARM] Emit Tag_ABI_FP_16bit_format build attribute.

[Charlie Turner]

Hi,

The __fp16 type is unconditionally exposed. Since -mfp16-format is not yet
supported, there is not a user switch to change this behavior. This build
attribute should capture the default behavior of the compiler, which is to
expose the IEEE 754 version of __fp16.
    
When -mfp16-format is emitted, that will be the way to control the value of
this build attribute.

Patch attached, differential keeps hanging for me today.

Kind regards,
Charlie.
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