[compiler-rt] [compiler-rt] Implement __extendxftf2 and __trunctfxf2 for x86_64 (PR #66918)

[Alexander Shaposhnikov via llvm-commits]

alexander-shaposhnikov wrote:

@arichardson - yeah, there are opportunities for clean ups, adding these conversions will unblock a few things => so wanted to do them afterwards.

https://github.com/llvm/llvm-project/pull/66918