[LV] Remove redundant check. nfc (#135605)

Remove the redundant `!TheLoop->contains(Op->getParent())` check since
`!TheLoop->contains(Op)` has already been verified.

Author: Mel-Chen

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -7212,9 +7212,6 @@ void LoopVectorizationCostModel::collectValuesToIgnore() {
         }))
       continue;
 
-    if (!TheLoop->contains(Op->getParent()))
-      continue;
-
     // If all of Op's users are in ValuesToIgnore, add it to ValuesToIgnore
     // which applies for both scalar and vector versions. Otherwise it is only
     // dead in vector versions, so only add it to VecValuesToIgnore.