[llvm] [LoopFusion]: Use the statistic name and description (NFC) (PR #207369)

[Ehsan Amiri via llvm-commits]

amehsan wrote:

> This change was made intentionally. Please see the discussion here: [d9b9449](https://github.com/llvm/llvm-project/commit/d9b94497ce3dc9e10ab6e24aea9afcee655f3b25)

Link to the PR: https://github.com/llvm/llvm-project/commit/d9b94497ce3dc9e10ab6e24aea9afcee655f3b25

https://github.com/llvm/llvm-project/pull/207369