[PATCH] D53670: Revert "Teach __libcpp_is_floating_point that __fp16 and _Float16 are"

[Richard Smith - zygoloid via Phabricator]

rsmith added a comment.

What's the problem with the state of affairs prior to this change? If some compiler / environment is defining a `__FLT16_MANT_DIG__` macro but not providing a `_Float16` type, isn't that just a bug in that environment?


Repository:
  rL LLVM

https://reviews.llvm.org/D53670