[llvm] [GISel] Explicitly disable BF16 tablegen patterns. (PR #124113)

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

I am relatively new to GISel intersection FP16. In the longer term, will we have a clean solution when GISel represents types natively? As Matt said above, an issue would be good to have and link to https://github.com/llvm/llvm-project/issues/115133?

https://github.com/llvm/llvm-project/pull/124113