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

[via llvm-commits]

AntonyCJ30 wrote:

Patch updated: kept getUnderlyingObject() check, removed SCEV logic. Now only checks for same SSA value with different underlying objects as requested. Removed the SCEV test case.

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