[interpreter] Unify meaning of register count operands.

src/interpreter/bytecode-array-iterator.cc

 // Copyright 2015 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/interpreter/bytecode-array-iterator.h"
 
 #include "src/objects-inl.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 110 matching lines @@
     case OperandType::kRegPair16:
     case OperandType::kRegOutPair8:
     case OperandType::kRegOutPair16:
       return 2;
     case OperandType::kRegOutTriple8:
     case OperandType::kRegOutTriple16:
       return 3;
     default: {
       if (operand_index + 1 !=
           Bytecodes::NumberOfOperands(current_bytecode())) {
-        // TODO(oth): Ensure all bytecodes specify the full range of registers
-        // with kRegCount (currently Call/CallJSRuntime are off by one due to
-        // reciever.
         OperandType next_operand_type =
             Bytecodes::GetOperandType(current_bytecode(), operand_index + 1);
         if (Bytecodes::IsRegisterCountOperandType(next_operand_type)) {
           return GetCountOperand(operand_index + 1);
         }
       }
       return 1;
     }
   }
 }
@@ skipping 17 matching lines @@
     return current_offset() + smi->value();
   } else {
     UNREACHABLE();
     return kMinInt;
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8