[interpreter] Wide register support.

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 29 matching lines @@
 uint32_t BytecodeArrayIterator::GetRawOperand(int operand_index,
                                               OperandType operand_type) const {
   DCHECK_GE(operand_index, 0);
   DCHECK_LT(operand_index, Bytecodes::NumberOfOperands(current_bytecode()));
   DCHECK_EQ(operand_type,
             Bytecodes::GetOperandType(current_bytecode(), operand_index));
   uint8_t* operand_start =
       bytecode_array()->GetFirstBytecodeAddress() + bytecode_offset_ +
       Bytecodes::GetOperandOffset(current_bytecode(), operand_index);
   switch (Bytecodes::SizeOfOperand(operand_type)) {
-    default:
-    case OperandSize::kNone:
-      UNREACHABLE();
     case OperandSize::kByte:
       return static_cast<uint32_t>(*operand_start);
     case OperandSize::kShort:
       return ReadUnalignedUInt16(operand_start);
+    case OperandSize::kNone:
+      UNREACHABLE();
   }
+  return 0;
 }
 
 
 int8_t BytecodeArrayIterator::GetImmediateOperand(int operand_index) const {
   uint32_t operand = GetRawOperand(operand_index, OperandType::kImm8);
   return static_cast<int8_t>(operand);
 }
 
 
 int BytecodeArrayIterator::GetCountOperand(int operand_index) const {
@@ skipping 55 matching lines @@
     return current_offset() + smi->value();
   } else {
     UNREACHABLE();
     return kMinInt;
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8