[VPlan] Remove SCEVToExpansion mapping (NFC).

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -4172,11 +4172,6 @@ class VPlan {
  /// definitions are VPValues that hold a pointer to their underlying IR.
  SmallVector<VPValue *, 16> VPLiveIns;
 
- /// Mapping from SCEVs to the VPValues representing their expansions.
- /// NOTE: This mapping is temporary and will be removed once all users have
- /// been modeled in VPlan directly.
- DenseMap<const SCEV *, VPValue *> SCEVToExpansion;
-
  /// Blocks allocated and owned by the VPlan. They will be deleted once the
  /// VPlan is destroyed.
  SmallVector<VPBlockBase *> CreatedBlocks;
@@ -4424,15 +4419,6 @@ class VPlan {
  LLVM_DUMP_METHOD void dump() const;
 #endif
 
- VPValue *getSCEVExpansion(const SCEV *S) const {
- return SCEVToExpansion.lookup(S);
- }
-
- void addSCEVExpansion(const SCEV *S, VPValue *V) {
- assert(!SCEVToExpansion.contains(S) && "SCEV already expanded");
- SCEVToExpansion[S] = V;
- }
-
  /// Clone the current VPlan, update all VPValues of the new VPlan and cloned
  /// recipes to refer to the clones, and return it.
  VPlan *duplicate();

llvm/lib/Transforms/Vectorize/VPlanUtils.cpp

@@ -32,8 +32,6 @@ bool vputils::onlyScalarValuesUsed(const VPValue *Def) {
 }
 
 VPValue *vputils::getOrCreateVPValueForSCEVExpr(VPlan &Plan, const SCEV *Expr) {
- if (auto *Expanded = Plan.getSCEVExpansion(Expr))
- return Expanded;
  VPValue *Expanded = nullptr;
  if (auto *E = dyn_cast<SCEVConstant>(Expr))
  Expanded = Plan.getOrAddLiveIn(E->getValue());
@@ -50,7 +48,6 @@ VPValue *vputils::getOrCreateVPValueForSCEVExpr(VPlan &Plan, const SCEV *Expr) {
  Plan.getEntry()->appendRecipe(Expanded->getDefiningRecipe());
  }
  }
- Plan.addSCEVExpansion(Expr, Expanded);
  return Expanded;
 }