[turbofan] Add support for copy-on-write element stores.

src/interface-descriptors.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CALL_INTERFACE_DESCRIPTOR_H_
 #define V8_CALL_INTERFACE_DESCRIPTOR_H_
 
 #include <memory>
 
 #include "src/assembler.h"
@@ skipping 37 matching lines @@
   V(CreateAllocationSite)              \
   V(CreateWeakCell)                    \
   V(CallFunction)                      \
   V(CallFunctionWithFeedback)          \
   V(CallFunctionWithFeedbackAndVector) \
   V(CallConstruct)                     \
   V(CallTrampoline)                    \
   V(ConstructStub)                     \
   V(ConstructTrampoline)               \
   V(RegExpConstructResult)             \
+  V(CopyFixedArray)                    \
   V(TransitionElementsKind)            \
   V(AllocateHeapNumber)                \
   V(AllocateFloat32x4)                 \
   V(AllocateInt32x4)                   \
   V(AllocateUint32x4)                  \
   V(AllocateBool32x4)                  \
   V(AllocateInt16x8)                   \
   V(AllocateUint16x8)                  \
   V(AllocateBool16x8)                  \
   V(AllocateInt8x16)                   \
@@ skipping 573 matching lines @@
 class StoreGlobalViaContextDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kSlot, kValue)
   DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(StoreGlobalViaContextDescriptor,
                                                CallInterfaceDescriptor)
 
   static const Register SlotRegister();
   static const Register ValueRegister();
 };
 
+class CopyFixedArrayDescriptor : public CallInterfaceDescriptor {
+ public:
+  DEFINE_PARAMETERS(kSource)
+  DECLARE_DEFAULT_DESCRIPTOR(CopyFixedArrayDescriptor, CallInterfaceDescriptor,
+                             kParameterCount)
+};
 
 class TransitionElementsKindDescriptor : public CallInterfaceDescriptor {
  public:
   DEFINE_PARAMETERS(kObject, kMap)
   DECLARE_DESCRIPTOR(TransitionElementsKindDescriptor, CallInterfaceDescriptor)
 };
 
 
 class AllocateHeapNumberDescriptor : public CallInterfaceDescriptor {
  public:
@@ skipping 266 matching lines @@
 }  // namespace v8
 
 
 #if V8_TARGET_ARCH_ARM64
 #include "src/arm64/interface-descriptors-arm64.h"
 #elif V8_TARGET_ARCH_ARM
 #include "src/arm/interface-descriptors-arm.h"
 #endif
 
 #endif  // V8_CALL_INTERFACE_DESCRIPTOR_H_