We don't need 128-bit integers here, instead rewrite the fp_test.h helpers
to avoid the need for __int128. Also change the high argument for
compareResultF80() and F80FromRep80() to be uint16_t since values greater
than this do not make any sense. This should allow the compiler to detect
accidentally swapping the arguments.
Reviewed By: biabbas, alexander-shaposhnikov
Pull Request: https://github.com/llvm/llvm-project/pull/117818
d33dc14833