[turbofan] Sparse representation for state values

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index f204bb849e4045acef928a2068130f5572112cd4..c64e8e078a4ccd09e4dc59da3f02cdff056dd707 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -480,6 +480,11 @@ size_t InstructionSelector::AddOperandToStateValueDescriptor(
     StateValueList* values, InstructionOperandVector* inputs,
     OperandGenerator* g, StateObjectDeduplicator* deduplicator, Node* input,
     MachineType type, FrameStateInputKind kind, Zone* zone) {
+  if (input == nullptr) {
+    values->PushOptimizedOut();
+    return 0;
+  }
+
   switch (input->opcode()) {
     case IrOpcode::kObjectState: {
       UNREACHABLE();