[Bug target/112993] rs6000: Rework precision for 128bit float types and modes

[linkw at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112993
Bug 112993 depends on bug 112788, which changed state.

Bug 112788 Summary: [14 regression] ICEs in fold_range, at range-op.cc:206 
after r14-5972-gea19de921b01a6
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112788

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED