[PATCH] [AArch64 NEON]Replace fpimm with fpz32 for floating compare with zero.

[Tim Northover]

> The reason changing fpz32short to fpz32 is that we think it's a bug in
> ARMARM: all floating point zero should use unique syntax, and obviously #0.0
> is more appropriate than #0.  ARMARM will fix this in future.

Thanks Kevin. That's actually an even neater solution. The patch looks
fine then.

Cheers.

Tim.