[llvm] [FastIsel] Get the right register type for call instruction (PR #164565)

[Luo Yuanke via llvm-commits]

LuoYuanke wrote:

> Does this solve #134222?

Solve the same issue of https://godbolt.org/z/15K5Pb7GG which generate incorrect instruction "call    __truncsfbf2 at PLT". The callee return bf16 value through xmm0, so don't need to convert from f32 to bf16.

https://github.com/llvm/llvm-project/pull/164565