[ignition] Rewrite reverse iterator as random iterator

src/interpreter/bytecode-array-reverse-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-reverse-iterator.h"
-#include "src/objects-inl.h"
-
-namespace v8 {
-namespace internal {
-namespace interpreter {
-
-BytecodeArrayReverseIterator::BytecodeArrayReverseIterator(
-    Handle<BytecodeArray> bytecode_array, Zone* zone)
-    : BytecodeArrayAccessor(bytecode_array, 0), offsets_(zone) {
-  // Run forwards through the bytecode array to determine the offset of each
-  // bytecode.
-  while (current_offset() < bytecode_array->length()) {
-    offsets_.push_back(current_offset());
-    SetOffset(current_offset() + current_bytecode_size());
-  }
-  Reset();
-}
-
-void BytecodeArrayReverseIterator::Advance() {
-  it_offsets_++;
-  UpdateOffsetFromIterator();
-}
-
-void BytecodeArrayReverseIterator::Reset() {
-  it_offsets_ = offsets_.rbegin();
-  UpdateOffsetFromIterator();
-}
-
-bool BytecodeArrayReverseIterator::done() const {
-  return it_offsets_ == offsets_.rend();
-}
-
-void BytecodeArrayReverseIterator::UpdateOffsetFromIterator() {
-  if (it_offsets_ != offsets_.rend()) {
-    SetOffset(*it_offsets_);
-  }
-}
-
-}  // namespace interpreter
-}  // namespace internal
-}  // namespace v8