[llvm] [LoopVectorizer] Add a -force-vscale-for-tuning override option. (PR #156916)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index bf84a571e..68019b7b5 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -303,9 +303,9 @@ static cl::opt<bool> ForceTargetSupportsScalableVectors(
         "Pretend that scalable vectors are supported, even if the target does "
         "not support them. This flag should only be used for testing."));
 
-static cl::opt<unsigned>
-    VScaleForTuningOpt("force-vscale-for-tuning", cl::Hidden,
-                       cl::desc("Force a vscale for tuning factor in the loop vectorizer"));
+static cl::opt<unsigned> VScaleForTuningOpt(
+    "force-vscale-for-tuning", cl::Hidden,
+    cl::desc("Force a vscale for tuning factor in the loop vectorizer"));
 
 static cl::opt<unsigned> SmallLoopCost(
     "small-loop-cost", cl::init(20), cl::Hidden,

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https://github.com/llvm/llvm-project/pull/156916