[PATCH] D40673: Add _Float128 as alias to __float128 to enable compilations on Fedora27/glibc2-26

[Richard Smith - zygoloid via Phabricator via cfe-commits]

rsmith added a comment.

Per https://gcc.gnu.org/onlinedocs/gcc/Floating-Types.html, this doesn't appear to be correct: `_Float128` is only *sometimes* the same type as `__float128`.


https://reviews.llvm.org/D40673