[PATCH][AArch64] Emit SIMD moves as mov

[Wilco Dijkstra]

James Greenhalgh wrote:
> 
> Does this introduce a dependency on a particular binutils version, or have
> we always supported this alias?
>
> The patch looks OK, but I don't want to introduce a new dependency so please
> check how far back this is supported.

Well gas/testsuite/gas/aarch64/alias.s contains "mov     v0.8b, v1.8b"
since binutils 2.23, which was the first release with AArch64.

Wilco