[turbofan] escape analysis supports arguments object and rest elements

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 46829593a4ef6d8123344723503d1cde9b3fbb66..b823e0fa154df51dd0346d71d18a98e882c7ab87 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -297,6 +297,11 @@ SparseInputMask SparseInputMaskOf(Operator const*);
 ZoneVector<MachineType> const* MachineTypesOf(Operator const*)
     WARN_UNUSED_RESULT;
 
+// The ArgumentsElementsState can either describe an unmapped arguments backing
+// store or the backing store of the rest parameters. IsRestOf(op) is true in
+// the second case.
+bool IsRestOf(Operator const*);
+
 // Interface for building common operators that can be used at any level of IR,
 // including JavaScript, mid-level, and low-level.
 class V8_EXPORT_PRIVATE CommonOperatorBuilder final
@@ -362,7 +367,7 @@ class V8_EXPORT_PRIVATE CommonOperatorBuilder final
   const Operator* StateValues(int arguments, SparseInputMask bitmask);
   const Operator* TypedStateValues(const ZoneVector<MachineType>* types,
                                    SparseInputMask bitmask);
-  const Operator* ArgumentsObjectState();
+  const Operator* ArgumentsElementsState(bool is_rest);
   const Operator* ObjectState(int pointer_slots);
   const Operator* TypedObjectState(const ZoneVector<MachineType>* types);
   const Operator* FrameState(BailoutId bailout_id,