[Interpreter] Make InterpreterAssembler a subclass of CodeStubAssembler.

src/ppc/interface-descriptors-ppc.cc

 // 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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 386 matching lines @@
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       r3,  // callee
       r7,  // call_data
       r5,  // holder
       r4,  // 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[] = {
       r3,  // argument count (not including receiver)
       r5,  // address of first argument
       r4   // the target callable to be call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
 void InterpreterPushArgsAndConstructDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       r3,  // argument count (not including receiver)
       r6,  // new target
       r4,  // constructor to call
       r5   // address of the first argument
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
-
 void InterpreterCEntryDescriptor::InitializePlatformSpecific(
     CallInterfaceDescriptorData* data) {
   Register registers[] = {
       r3,  // argument count (argc)
       r5,  // address of first argument (argv)
       r4   // the runtime function to call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC