[libc-commits] [libc] [reland][libc] `FPRep` builders return `FPRep` instead of raw `StorageType` (PR #78978)

[Guillaume Chatelet via libc-commits]

gchatelet wrote:

Change is absolutely minor. I removed `UP::` from libc/src/__support/FPUtil/FPBits.h:398.
I'll proceed and reland this.

https://github.com/llvm/llvm-project/pull/78978