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

src/arm64/builtins-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/arm64/frames-arm64.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
@@ skipping 1070 matching lines @@
 
 
 static void Generate_EnterBytecodeDispatch(MacroAssembler* masm) {
   // Initialize register file register and dispatch table register.
   __ Add(kInterpreterRegisterFileRegister, fp,
          Operand(InterpreterFrameConstants::kRegisterFilePointerFromFp));
   __ Mov(kInterpreterDispatchTableRegister,
          Operand(ExternalReference::interpreter_dispatch_table_address(
              masm->isolate())));
 
-  // Get the context from the frame.
-  __ Ldr(kContextRegister,
-         MemOperand(kInterpreterRegisterFileRegister,
-                    InterpreterFrameConstants::kContextFromRegisterPointer));
-
   // Get the bytecode array pointer from the frame.
   __ Ldr(
       kInterpreterBytecodeArrayRegister,
       MemOperand(kInterpreterRegisterFileRegister,
                  InterpreterFrameConstants::kBytecodeArrayFromRegisterPointer));
 
   if (FLAG_debug_code) {
     // Check function data field is actually a BytecodeArray object.
     __ AssertNotSmi(kInterpreterBytecodeArrayRegister,
                     kFunctionDataShouldBeBytecodeArrayOnInterpreterEntry);
@@ skipping 1648 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM