[interpreter] Add basic framework for bytecode handler code generation.

src/compiler/x64/linkage-x64.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.
 
 #include "src/assembler.h"
 #include "src/code-stubs.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/linkage-impl.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 #ifdef _WIN64
 const bool kWin64 = true;
 #else
 const bool kWin64 = false;
 #endif
 
 struct X64LinkageHelperTraits {
   static Register ReturnValueReg() { return rax; }
   static Register ReturnValue2Reg() { return rdx; }
   static Register JSCallFunctionReg() { return rdi; }
   static Register ContextReg() { return rsi; }
+  static Register InterpreterBytecodePointerReg() { return rbx; }
+  static Register InterpreterDispatchTableReg() { return rdi; }
   static Register RuntimeCallFunctionReg() { return rbx; }
   static Register RuntimeCallArgCountReg() { return rax; }
   static RegList CCalleeSaveRegisters() {
     if (kWin64) {
       return rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() |
              r14.bit() | r15.bit();
     } else {
       return rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit();
     }
   }
@@ skipping 46 matching lines @@
                                    return_type);
 }
 
 
 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
                                                   const MachineSignature* sig) {
   return LH::GetSimplifiedCDescriptor(zone, sig);
 }
 
 
-CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(
-    Zone* zone, const MachineSignature* sig) {
-  return LH::GetInterpreterDispatchDescriptor(zone, sig);
+CallDescriptor* Linkage::GetInterpreterDispatchDescriptor(Zone* zone) {
+  return LH::GetInterpreterDispatchDescriptor(zone);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8