[llvm] [LLVM] Select fma_mix for v_cvt_f32_f16 and v_add_f32/v_mul_f32 (PR #160151)

[Acim Maravic via llvm-commits]

Acim-Maravic wrote:

> Are there any tests for when _both_ operands of an add/sub/mul are extended?

v_mad_mix_f32_f16lo_add_f16lo/v_mad_mix_f32_f16lo_mul_f16lo/v_mad_mix_f32_f16lo_sub_f16lo

https://github.com/llvm/llvm-project/pull/160151