[llvm] [LV][NFC] Move and add truncated-related FindLastIV reduction test cases. (PR #67674)

[Mel Chen via llvm-commits]

================
@@ -0,0 +1,285 @@
+; RUN: opt -passes=loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -S < %s | FileCheck %s --check-prefix=CHECK
+; RUN: opt -passes=loop-vectorize -force-vector-interleave=4 -force-vector-width=4 -S < %s | FileCheck %s --check-prefix=CHECK
+; RUN: opt -passes=loop-vectorize -force-vector-interleave=4 -force-vector-width=1 -S < %s | FileCheck %s --check-prefix=CHECK
----------------
Mel-Chen wrote:

I prefer to keep "--check-prefix=CHECK". Will soon be changed to "--check-prefix=CHECK-VF4IC1 --check-prefix=CHECK".

https://github.com/llvm/llvm-project/pull/67674