Fix for potential issue related to replacing CheckMaps with values.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index b2e0d00f9656292e2200841373e71ba7c58fde43..2f0c86d60545223b1c92c623d5b8cae294ac74cb 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -3933,7 +3933,13 @@ void HGraph::RestoreActualValues() {
 
     for (HInstructionIterator it(block); !it.Done(); it.Advance()) {
       HInstruction* instruction = it.Current();
-      if (instruction->ActualValue() != instruction) {
+      if (instruction->ActualValue() == instruction) continue;
+      if (instruction->CheckFlag(HValue::kIsDead)) {
+        // The instruction was marked as deleted but left in the graph
+        // as a control flow dependency point for subsequent
+        // instructions.
+        instruction->DeleteAndReplaceWith(instruction->ActualValue());
+      } else {
         ASSERT(instruction->IsInformativeDefinition());
         if (instruction->IsPurelyInformativeDefinition()) {
           instruction->DeleteAndReplaceWith(instruction->RedefinedOperand());