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

[Ryotaro Kasuga via llvm-commits]

================
@@ -0,0 +1,62 @@
+; RUN: opt < %s -passes=loop-interchange -loop-interchange-profitabilities=ignore -debug-only=loop-interchange -disable-output -S 2>%t
+; RUN: FileCheck --input-file=%t %s
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kasuga-fj wrote:

```suggestion
; RUN: opt < %s -passes=loop-interchange -loop-interchange-profitabilities=ignore -debug-only=loop-interchange -disable-output 2>&1 | FileCheck %s
; REQUIRES: asserts
```

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