[clang] [llvm] AMDGPU: Rename intrinsics and remove f16/bf16 versions for load transpose (PR #86313)

[Sirish Pande via cfe-commits]

srpande wrote:

There is no issue in changing the names in principle. Curious, what is the rationale to use more demangled names?

https://github.com/llvm/llvm-project/pull/86313