[Bug target/111306] [12,13] macro-fusion makes error on conjugate complex multiplication fp16

[crazylht at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111306

--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> ---
A related PR111335 for fmaddcph , similar but not the same, PR111335 is due to
precision difference for complex _Float16 fma, fmaddcph a, b, c is not equal to
fmaddcph b, a, c