[llvm] [LoopUnroll] Introduce parallel accumulators when unrolling FP reductions. (PR #166630)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Utils/LoopUnroll.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Transforms/Utils/LoopUnroll.cpp b/llvm/lib/Transforms/Utils/LoopUnroll.cpp
index 8e878d8cb..5f1db9c54 100644
--- a/llvm/lib/Transforms/Utils/LoopUnroll.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUnroll.cpp
@@ -1263,7 +1263,7 @@ llvm::canParallelizeReductionWhenUnrolling(PHINode &Phi, Loop *L,
     return std::nullopt;
 
   if (RdxDesc.hasExactFPMath())
-      return std::nullopt;
+    return std::nullopt;
 
   if (RdxDesc.IntermediateStore)
     return std::nullopt;

``````````

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https://github.com/llvm/llvm-project/pull/166630