[llvm] [LV] Fix ScalarIVSteps vplan pattern matcher, remove m_CanonicalIV() (PR #138298)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp,h -- llvm/unittests/Transforms/Vectorize/VPlanPatternMatchTest.cpp llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h llvm/lib/Transforms/Vectorize/VPlanUtils.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/unittests/Transforms/Vectorize/VPlanPatternMatchTest.cpp b/llvm/unittests/Transforms/Vectorize/VPlanPatternMatchTest.cpp
index 9b02ceb7e..e38b4fad8 100644
--- a/llvm/unittests/Transforms/Vectorize/VPlanPatternMatchTest.cpp
+++ b/llvm/unittests/Transforms/Vectorize/VPlanPatternMatchTest.cpp
@@ -44,8 +44,9 @@ TEST_F(VPPatternMatchTest, ScalarIVSteps) {
 
   ASSERT_TRUE(match(Steps, m_ScalarIVSteps(m_Specific(CanonicalIVPHI),
                                            m_SpecificInt(1), m_Specific(VF))));
-  ASSERT_FALSE(match(Steps2, m_ScalarIVSteps(m_Specific(CanonicalIVPHI),
-                                            m_SpecificInt(1), m_Specific(VF))));
+  ASSERT_FALSE(
+      match(Steps2, m_ScalarIVSteps(m_Specific(CanonicalIVPHI),
+                                    m_SpecificInt(1), m_Specific(VF))));
   ASSERT_TRUE(match(Steps2, m_ScalarIVSteps(m_Specific(CanonicalIVPHI),
                                             m_SpecificInt(2), m_Specific(VF))));
 }

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https://github.com/llvm/llvm-project/pull/138298