Index: lib/Analysis/ScopInfo.cpp
===================================================================
--- lib/Analysis/ScopInfo.cpp
+++ lib/Analysis/ScopInfo.cpp
@@ -1294,7 +1294,6 @@
     MAL.emplace_front(Access);
   } else if (Access->isValueKind() && Access->isWrite()) {
     Instruction *AccessVal = cast<Instruction>(Access->getAccessValue());
-    assert(Parent.getStmtFor(AccessVal) == this);
     assert(!ValueWrites.lookup(AccessVal));
 
     ValueWrites[AccessVal] = Access;
@@ -3795,10 +3794,16 @@
 
 void Scop::removeFromStmtMap(ScopStmt &Stmt) {
   if (Stmt.isRegionStmt())
-    for (BasicBlock *BB : Stmt.getRegion()->blocks())
+    for (BasicBlock *BB : Stmt.getRegion()->blocks()) {
       StmtMap.erase(BB);
-  else
+      for (Instruction &Inst : *BB)
+        InstStmtMap.erase(&Inst);
+    }
+  else {
     StmtMap.erase(Stmt.getBasicBlock());
+    for (Instruction &Inst : *Stmt.getBasicBlock())
+      InstStmtMap.erase(&Inst);
+  }
 }
 
 void Scop::removeStmts(std::function<bool(ScopStmt &)> ShouldDelete) {
@@ -4864,14 +4869,25 @@
   Stmts.emplace_back(*this, *BB, SurroundingLoop, Instructions);
   auto *Stmt = &Stmts.back();
   StmtMap[BB].push_back(Stmt);
+  for (Instruction *Inst : Instructions) {
+    assert(!InstStmtMap.count(Inst) &&
+           "Unexpected statement corresponding to the instruction.");
+    InstStmtMap[Inst] = Stmt;
+  }
 }
 
 void Scop::addScopStmt(Region *R, Loop *SurroundingLoop) {
   assert(R && "Unexpected nullptr!");
   Stmts.emplace_back(*this, *R, SurroundingLoop);
   auto *Stmt = &Stmts.back();
-  for (BasicBlock *BB : R->blocks())
+  for (BasicBlock *BB : R->blocks()) {
     StmtMap[BB].push_back(Stmt);
+    for (Instruction &Inst : *BB) {
+      assert(!InstStmtMap.count(&Inst) &&
+             "Unexpected statement corresponding to the instruction.");
+      InstStmtMap[&Inst] = Stmt;
+    }
+  }
 }
 
 ScopStmt *Scop::addScopStmt(__isl_take isl_map *SourceRel,