Merge pull request #12680 from CarolEidt/RefactorContain

Extract containment analysis

diff --cc src/jit/lower.cpp
Simple merge

diff --cc src/jit/lower.h
index cc12382,f4dab29..122cd24
--- 1/src/jit/lower.h
--- 2/src/jit/lower.h
+++ b/src/jit/lower.h
@@@ -271,9 -298,8 +298,10 @@@ private
      bool IsRMWIndirCandidate(GenTree* operand, GenTree* storeInd);
      bool IsBinOpInRMWStoreInd(GenTreePtr tree);
      bool IsRMWMemOpRootedAtStoreInd(GenTreePtr storeIndTree, GenTreePtr* indirCandidate, GenTreePtr* indirOpSource);
+     bool LowerRMWMemOp(GenTreeIndir* storeInd);
  #endif
 +
 +    void WidenSIMD12IfNecessary(GenTreeLclVarCommon* node);
      void LowerStoreLoc(GenTreeLclVarCommon* tree);
      GenTree* LowerArrElem(GenTree* node);
      void LowerRotate(GenTree* tree);

diff --cc src/jit/lsraarm.cpp
Simple merge

diff --cc src/jit/lsraarm64.cpp
Simple merge