[llvm] [msan] Use horizontal sub to compute shadow for horizontal add (PR #124835)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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git-clang-format --diff 7bd9c780e36399394fe8eae9678eb448d53e33f0 5dcb768e9b983db2384592cfb4f8b74361cae7d8 --extensions cpp -- llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index 8f014ce195..da16028f6c 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -4055,7 +4055,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
 
     Intrinsic::ID shadowIntrinsicID = I.getIntrinsicID();
 
-    switch(I.getIntrinsicID()) {
+    switch (I.getIntrinsicID()) {
     case Intrinsic::x86_sse3_hsub_ps:
       shadowIntrinsicID = Intrinsic::x86_sse3_hadd_ps;
       break;
@@ -4110,11 +4110,10 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
 
     default:
       break;
-   }
+    }
 
-    return handleIntrinsicByApplyingToShadow(
-        I, shadowIntrinsicID,
-        /*trailingVerbatimArgs*/ 0);
+    return handleIntrinsicByApplyingToShadow(I, shadowIntrinsicID,
+                                             /*trailingVerbatimArgs*/ 0);
   }
 
   /// Handle Arm NEON vector store intrinsics (vst{2,3,4}, vst1x_{2,3,4},

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https://github.com/llvm/llvm-project/pull/124835