[llvm] [LoopFusion] Fix false-positive dependency blocking fusion of idempot… (PR #206401)

[via llvm-commits]

AntonyCJ30 wrote:

The CI failures have been addressed:

1. **LoopFusion test (`loop_invariant.ll`)** - Fixed. Updated the CHECK line to match the actual output (`Fusion is performed`). All LoopFusion tests now pass locally.

2. **MIPS test (`f16-llvm-ir.ll`)** - This failure is unrelated to this PR. It passes on my local machine after fetching new commits from upstream main.

https://github.com/llvm/llvm-project/pull/206401