[llvm] Revert "Redesign Straight-Line Strength Reduction (SLSR) (#162930)" (PR #169546)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
index e94ad1999..fe17dded7 100644
--- a/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/StraightLineStrengthReduce.cpp
@@ -271,9 +271,10 @@ FunctionPass *llvm::createStraightLineStrengthReducePass() {
 
 bool StraightLineStrengthReduce::isBasisFor(const Candidate &Basis,
                                             const Candidate &C) {
-  return (Basis.Ins != C.Ins && // skip the same instruction
-          // They must have the same type too. Basis.Base == C.Base
-          // doesn't guarantee their types are the same (PR23975).
+  return (Basis.Ins !=
+              C.Ins && // skip the same instruction
+                       // They must have the same type too. Basis.Base == C.Base
+                       // doesn't guarantee their types are the same (PR23975).
           Basis.Ins->getType() == C.Ins->getType() &&
           // Basis must dominate C in order to rewrite C with respect to Basis.
           DT->dominates(Basis.Ins->getParent(), C.Ins->getParent()) &&

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https://github.com/llvm/llvm-project/pull/169546