[llvm] [LoopInterchange] Supported partially-perfect Loop Nests (PR #199511)

[Rohit Garg via llvm-commits]

rohgarg-qual wrote:

I temporarily marked` LLVM :: Transforms/LoopInterchange/bail-out-one-loop.ll` as XFAIL.

The test currently expects a remark for a single loop with depth 1. In my opinion `hasSupportedLoopDepth` should only validate the upper bound, i.e., whether the loop depth exceeds 10. Loop interchange is not meaningful when there is only a single loop at depth 1.

https://github.com/llvm/llvm-project/pull/199511