[Bug target/71806] PowerPC -mcpu=power9 enables __float128 without an explicit -mfloat128

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71806

--- Comment #4 from Michael Meissner <meissner at gcc dot gnu.org> ---
Fixed on trunk, subversion id 238161.  Fixed on GCC 6.2 branch, subversion id
238165.