[llvm] [SLP] NFC. Replace MainOp and AltOp in TreeEntry with InstructionsState. (PR #120198)

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``````````bash
git-clang-format --diff 66acb2694655321b37a1ee3ff19207a111756562 bb3dc5eedac49bcc05f2435070b432df63bcd070 --extensions cpp -- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 6c7587488f..fd68f08df2 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -18385,20 +18385,21 @@ void BoUpSLP::computeMinimumValueSizes() {
                  });
       IsSignedCmp =
           NodeIdx < VectorizableTree.size() &&
-          any_of(VectorizableTree[NodeIdx]->UserTreeIndices,
-                 [&](const EdgeInfo &EI) {
-                   return (EI.UserTE->isInstructionsStateValid() &&
-                           EI.UserTE->getOpcode() == Instruction::ICmp) &&
-                          any_of(EI.UserTE->Scalars, [&](Value *V) {
-                            auto *IC = dyn_cast<ICmpInst>(V);
-                            return IC &&
-                                   (IC->isSigned() ||
-                                    !isKnownNonNegative(IC->getOperand(0),
-                                                        SimplifyQuery(*DL)) ||
-                                    !isKnownNonNegative(IC->getOperand(1),
-                                                        SimplifyQuery(*DL)));
-                          });
-                 });
+          any_of(
+              VectorizableTree[NodeIdx]->UserTreeIndices,
+              [&](const EdgeInfo &EI) {
+                return (EI.UserTE->isInstructionsStateValid() &&
+                        EI.UserTE->getOpcode() == Instruction::ICmp) &&
+                       any_of(EI.UserTE->Scalars, [&](Value *V) {
+                         auto *IC = dyn_cast<ICmpInst>(V);
+                         return IC &&
+                                (IC->isSigned() ||
+                                 !isKnownNonNegative(IC->getOperand(0),
+                                                     SimplifyQuery(*DL)) ||
+                                 !isKnownNonNegative(IC->getOperand(1),
+                                                     SimplifyQuery(*DL)));
+                       });
+              });
     }
 
     // If the maximum bit width we compute is less than the width of the roots'

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https://github.com/llvm/llvm-project/pull/120198