[llvm] [X86] Add missing vNbf16 handling in X86CallingConv.td file (PR #127102)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> please can you regenerate the breaking tests?

Take a look at the tests, we cannot simply remove the handling in X86ISelLoweringCall. Unlike FP16, BF16 vectors are legal only when AVX512BF16/AVXNECONVERT are ready. Though we may make it legal for SSE2, we may just leave the code as is.

https://github.com/llvm/llvm-project/pull/127102