[Interpreter] Make InterpreterAssembler a subclass of CodeStubAssembler.

src/x64/interface-descriptors-x64.cc

 // Copyright 2012 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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 387 matching lines @@
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rdi,  // callee
       rbx,  // call_data
       rcx,  // holder
       rdx,  // api_function_address
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
+void InterpreterDispatchDescriptor::InitializePlatformSpecific(
+    CallInterfaceDescriptorData* data) {
+  Register registers[] = {
+      kInterpreterAccumulatorRegister, kInterpreterRegisterFileRegister,
+      kInterpreterBytecodeOffsetRegister, kInterpreterBytecodeArrayRegister,
+      kInterpreterDispatchTableRegister};
+  data->InitializePlatformSpecific(arraysize(registers), registers);
+}
 
 void InterpreterPushArgsAndCallDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rax,  // argument count (not including receiver)
       rbx,  // address of first argument
       rdi   // the target callable to be call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
 void InterpreterPushArgsAndConstructDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rax,  // argument count (not including receiver)
       rdx,  // new target
       rdi,  // constructor
       rbx,  // address of first argument
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
 void InterpreterCEntryDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       rax,  // argument count (argc)
       r15,  // address of first argument (argv)
       rbx   // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64