[Interpreter] No longer require context machine register in bytecode handlers

src/x64/builtins-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/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 794 matching lines @@
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ movp(kInterpreterRegisterFileRegister, rbp);
   __ addp(kInterpreterRegisterFileRegister,
           Immediate(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ Move(
       kInterpreterDispatchTableRegister,
       ExternalReference::interpreter_dispatch_table_address(masm->isolate()));
 
-  // Get the context from the frame.
-  __ movp(kContextRegister,
-          Operand(kInterpreterRegisterFileRegister,
-                  InterpreterFrameConstants::kContextFromRegisterPointer));
-
   // Get the bytecode array pointer from the frame.
   __ movp(
       kInterpreterBytecodeArrayRegister,
       Operand(kInterpreterRegisterFileRegister,
               InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
     __ AssertNotSmi(kInterpreterBytecodeArrayRegister);
     __ CmpObjectType(kInterpreterBytecodeArrayRegister, BYTECODE_ARRAY_TYPE,
@@ skipping 1957 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64