[llvm] [llvm-mca] Round UP when formatting Reciprocal Throughput (PR #159544)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 approved this pull request.

LGTM if this improves consistency.

Would still be nice if someone had a better idea of why this behavior is occurring.

https://github.com/llvm/llvm-project/pull/159544