[Bug target/71869] __builtin_isgreater raises an invalid exception on PPC64 using __float128 inputs.

[murphyp at linux dot vnet.ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71869

--- Comment #1 from Paul E. Murphy <murphyp at linux dot vnet.ibm.com> ---
__builtin_isfinite also has a similar issue.