[PATCH] [AArch64] Make FP instructions optional

[Tim Northover]

>> Is this -mattr needed? I really hope not...
> AFAIK this is consistent with llvm-mc, e.g. in the ARM backend you also have to specify each feature.

Yuck, you're right. So much for my mental happy place where this
abomination never existed. ;-).

Your latest patch still has a duplicate function, I believe: @test_va_copy_nofp.

Other than that, it looks good. I'll trust you to merge that one in if
it actually is a duplicate.

Cheers.

Tim.