[llvm] [AArch64][NFC] Fixup assembler directive tests for SVE/SME (PR #116253)

[via llvm-commits]

Lukacma wrote:

I think the patch is too large at the moment and it seems to add more than coverage for sme-f16f16, sme-f8f16, and sme-f8f32, if I am understand correctly. Could you split into 1 patch for changes and 1 or more( preferably more but leaving it to your judgment) patches for adding new tests ?

https://github.com/llvm/llvm-project/pull/116253