[llvm] [IR] Add helper `CmpPredicate::dropSameSign` (PR #134071)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/include/llvm/IR/CmpPredicate.h llvm/lib/Analysis/ScalarEvolution.cpp llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index ff8f8f3d9..5f7364456 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -11792,8 +11792,7 @@ bool ScalarEvolution::isImpliedCond(CmpPredicate Pred, const SCEV *LHS,
         const SCEV *TruncFoundLHS = getTruncateExpr(FoundLHS, NarrowType);
         const SCEV *TruncFoundRHS = getTruncateExpr(FoundRHS, NarrowType);
         // We cannot preserve samesign after truncation.
-        if (isImpliedCondBalancedTypes(Pred, LHS, RHS,
-                                       FoundPred.dropSameSign(),
+        if (isImpliedCondBalancedTypes(Pred, LHS, RHS, FoundPred.dropSameSign(),
                                        TruncFoundLHS, TruncFoundRHS, CtxI))
           return true;
       }

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https://github.com/llvm/llvm-project/pull/134071