[llvm] [SDAG][ISel][TableGen][LoongArch] Report error for trivial bitcasts when there are predicate calls (PR #116075)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> The pattern was added before build_vector lowering was added. Maybe it used to be needed?

No tests in https://reviews.llvm.org/D155829. I am not sure if it is safe to remove these patterns.
cc @wangleiat @SixWeining @xen0n 


https://github.com/llvm/llvm-project/pull/116075