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

src/compiler/linkage.h

 // 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.
 
 #ifndef V8_COMPILER_LINKAGE_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/frame.h"
 #include "src/compiler/operator.h"
@@ skipping 290 matching lines @@
 //
 // Can be used to translate {arg_index} (i.e. index of the call node input) as
 // well as {param_index} (i.e. as stored in parameter nodes) into an operator
 // representing the architecture-specific location. The following call node
 // layouts are supported (where {n} is the number of value inputs):
 //
 //                        #0          #1     #2     [...]             #n
 // Call[CodeStub]         code,       arg 1, arg 2, [...],            context
 // Call[JSFunction]       function,   rcvr,  arg 1, [...], new, #arg, context
 // Call[Runtime]          CEntryStub, arg 1, arg 2, [...], fun, #arg, context
-// Call[BytecodeDispatch] address,    arg 1, arg 2, [...],            context
+// Call[BytecodeDispatch] address,    arg 1, arg 2, [...]
 class Linkage : public ZoneObject {
  public:
   explicit Linkage(CallDescriptor* incoming) : incoming_(incoming) {}
 
   static CallDescriptor* ComputeIncoming(Zone* zone, CompilationInfo* info);
 
   // The call descriptor for this compilation unit describes the locations
   // of incoming parameters and the outgoing return value(s).
   CallDescriptor* GetIncomingDescriptor() const { return incoming_; }
   static CallDescriptor* GetJSCallDescriptor(Zone* zone, bool is_osr,
@@ skipping 81 matching lines @@
   CallDescriptor* const incoming_;
 
   DISALLOW_COPY_AND_ASSIGN(Linkage);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_H_