[Interpreter] Fix incorrect Register OperandSize calculation for ExtraWide.

src/interpreter/bytecodes.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/bytecodes.h"
 
 #include <iomanip>
 
 #include "src/frames.h"
 #include "src/interpreter/bytecode-traits.h"
@@ skipping 706 matching lines @@
 }
 
 bool Register::is_bytecode_offset() const {
   return index() == kBytecodeOffsetRegisterIndex;
 }
 
 OperandSize Register::SizeOfOperand() const {
   int32_t operand = ToOperand();
   if (operand >= kMinInt8 && operand <= kMaxInt8) {
     return OperandSize::kByte;
-  } else if (index_ >= kMinInt16 && index_ <= kMaxInt16) {
+  } else if (operand >= kMinInt16 && operand <= kMaxInt16) {
     return OperandSize::kShort;
   } else {
     return OperandSize::kQuad;
   }
 }
 
 bool Register::AreContiguous(Register reg1, Register reg2, Register reg3,
                              Register reg4, Register reg5) {
   if (reg1.index() + 1 != reg2.index()) {
     return false;
@@ skipping 29 matching lines @@
   } else {
     std::ostringstream s;
     s << "r" << index();
     return s.str();
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8