[clang] AMDGPU: Rename and add bf16 support for global_load_tr builtins (PR #86202)

[Stanislav Mekhanoshin via cfe-commits]

https://github.com/rampitec commented:

Do you want to rename intrinsics as well? Because now intrinsic names do not match builtin names.

https://github.com/llvm/llvm-project/pull/86202