Update llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

Avoid warning on release build

Co-authored-by: Florian Hahn <[email protected]>

Author: Mel-Chen

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -7699,6 +7699,7 @@ static void fixReductionScalarResumeWhenVectorizingEpilog(
               m_SpecificICmp(ICmpInst::ICMP_EQ, m_Specific(OrigResumeV),
                              m_Specific(RdxDesc.getRecurrenceStartValue())));
     assert(IsExpectedPattern && "Unexpected reduction resume pattern");
+    (void) IsExpectedPattern;
     MainResumeValue = OrigResumeV;
   }
   PHINode *MainResumePhi = cast<PHINode>(MainResumeValue);