[PATCH 5/14][AArch64] Add basic fp16 support

[Alan Lawrence]

Joseph Myers wrote:
 >
> I'd think it would be desirable to share tests between ARM and AArch64 as 
> far as possible (where applicable to both - so not the tests for the 
> alternative format, and some of the gcc.target/arm/fp16-* tests using 
> scan-assembler might need adapting to work for AArch64).

I agree the most desirable outcome is for the ACLE spec to be normalized between 
the two architectures! In the meantime this implements the specification that we 
have...

I attach a new patch that adds common ARM / AArch64 tests in 
gcc.target/aarch64/fp16 (i.e. beside the shared 
gcc.target/aarch64/advsimd-intrinsics). I've adapted two of the previous tests 
such that they pass on both ARM and AArch64. I'd like to propose this as a patch 
5a, and to drop those tests from the original patch 5.

I'll follow-up with a sort-through of the ARM tests, moving only those that can 
be shared, in due course.

Cheers, Alan
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