[llvm] [LLVM] Combine v_cvt_f32_f16 and v_add_f32/v_mul_f32 into v_fma_mix_f32 (PR #160151)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> Can you rephrase the title, it makes it sound like this is a machine combine when it isn't

bump 

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