[llvm] [NFC][SLP] Make choice of dyn_cast_or_null vs dyn_cast_or_present consistent (PR #228180)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp llvm/lib/Transforms/Vectorize/SLPVectorizer/SLPCompatibilityAnalysis.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index 46eb00286..6c8ae75a1 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -24154,8 +24154,8 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
             if (!Ins->hasOneUse())
               break;
             Op = Ins;
-            Ins =
-                dyn_cast_if_present<Instruction>(Ins->getUniqueUndroppableUser());
+            Ins = dyn_cast_if_present<Instruction>(
+                Ins->getUniqueUndroppableUser());
           } while (Ins && Ins->getOperand(0) == Op);
           SmallBitVector UseMask =
               buildUseMask(NumElts, InsertMask, UseMask::UndefsAsMask);

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https://github.com/llvm/llvm-project/pull/228180