[PATCH] D66862: Make lround builtin constexpr (and others)

[Zoe Carver via Phabricator via cfe-commits]

zoecarver added a comment.

(from IRC) Add tests for:

- out of range
- nan
- rounding up _and_ down

Also, use the builtin APFloat methods.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D66862/new/

https://reviews.llvm.org/D66862