diff --git a/lib/Transforms/Scalar/ConstantHoisting.cpp b/lib/Transforms/Scalar/ConstantHoisting.cpp
index b8c282a4e56..57a15214e65 100644
--- a/lib/Transforms/Scalar/ConstantHoisting.cpp
+++ b/lib/Transforms/Scalar/ConstantHoisting.cpp
@@ -87,10 +87,9 @@ struct ConstantCandidate {
 struct RebasedConstantInfo {
   ConstantUseListType Uses;
   Constant *Offset;
-  mutable BasicBlock *IDom;
 
   RebasedConstantInfo(ConstantUseListType &&Uses, Constant *Offset)
-    : Uses(Uses), Offset(Offset), IDom(nullptr) { }
+    : Uses(Uses), Offset(Offset) { }
 };
 
 /// \brief A base constant and all its rebased constants.
@@ -151,17 +150,6 @@ private:
     Entry = nullptr;
   }
 
-  /// \brief Find the common dominator of all uses and cache the result for
-  /// future lookup.
-  BasicBlock *getIDom(const RebasedConstantInfo &RCI) const {
-    if (RCI.IDom)
-      return RCI.IDom;
-    RCI.IDom = findIDomOfAllUses(RCI.Uses);
-    assert(RCI.IDom && "Invalid IDom.");
-    return RCI.IDom;
-  }
-
-  BasicBlock *findIDomOfAllUses(const ConstantUseListType &Uses) const;
   Instruction *findMatInsertPt(Instruction *Inst, unsigned Idx = ~0U) const;
   Instruction *findConstantInsertionPoint(const ConstantInfo &ConstInfo) const;
   void collectConstantCandidates(ConstCandMapType &ConstCandMap,
@@ -214,32 +202,6 @@ bool ConstantHoisting::runOnFunction(Function &Fn) {
   return MadeChange;
 }
 
-/// \brief Find nearest common dominator of all uses.
-/// FIXME: Replace this with NearestCommonDominator once it is in common code.
-BasicBlock *
-ConstantHoisting::findIDomOfAllUses(const ConstantUseListType &Uses) const {
-  // Collect all basic blocks.
-  SmallPtrSet<BasicBlock *, 8> BBs;
-  for (auto const &U : Uses)
-    BBs.insert(findMatInsertPt(U.Inst, U.OpndIdx)->getParent());
-
-  if (BBs.count(Entry))
-    return Entry;
-
-  while (BBs.size() >= 2) {
-    BasicBlock *BB, *BB1, *BB2;
-    BB1 = *BBs.begin();
-    BB2 = *std::next(BBs.begin());
-    BB = DT->findNearestCommonDominator(BB1, BB2);
-    if (BB == Entry)
-      return Entry;
-    BBs.erase(BB1);
-    BBs.erase(BB2);
-    BBs.insert(BB);
-  }
-  assert((BBs.size() == 1) && "Expected only one element.");
-  return *BBs.begin();
-}
 
 /// \brief Find the constant materialization insertion point.
 Instruction *ConstantHoisting::findMatInsertPt(Instruction *Inst,
@@ -262,12 +224,11 @@ Instruction *ConstantHoisting::findMatInsertPt(Instruction *Inst,
 Instruction *ConstantHoisting::
 findConstantInsertionPoint(const ConstantInfo &ConstInfo) const {
   assert(!ConstInfo.RebasedConstants.empty() && "Invalid constant info entry.");
-  // Collect all IDoms.
+  // Collect all basic blocks.
   SmallPtrSet<BasicBlock *, 8> BBs;
   for (auto const &RCI : ConstInfo.RebasedConstants)
-    BBs.insert(getIDom(RCI));
-
-  assert(!BBs.empty() && "No dominators!?");
+    for (auto const &U : RCI.Uses)
+      BBs.insert(U.Inst->getParent());
 
   if (BBs.count(Entry))
     return &Entry->front();