[llvm] [PowerPC] Fix handling of undefs in the PPC::isSplatShuffleMask query (PR #145149)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/PowerPC/PPCISelLowering.cpp
``````````

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<details>
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index d1b17f227..967ebc4cb 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -2245,12 +2245,12 @@ bool PPC::isSplatShuffleMask(ShuffleVectorSDNode *N, unsigned EltSize) {
     // An UNDEF element is a sequence of UNDEF bits.
     if (N->getMaskElt(i) < 0) {
       for (unsigned j = 1; j != EltSize; ++j)
-        if (N->getMaskElt(i+j) >= 0)
+        if (N->getMaskElt(i + j) >= 0)
+          return false;
+    } else
+      for (unsigned j = 0; j != EltSize; ++j)
+        if (N->getMaskElt(i + j) != N->getMaskElt(j))
           return false;
-    }
-    else for (unsigned j = 0; j != EltSize; ++j)
-      if (N->getMaskElt(i+j) != N->getMaskElt(j))
-        return false;
   }
   return true;
 }

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https://github.com/llvm/llvm-project/pull/145149