Move Hydrogen and Lithium to src/crankshaft/

src/hydrogen-mark-unreachable.cc

-// Copyright 2013 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/hydrogen-mark-unreachable.h"
-
-namespace v8 {
-namespace internal {
-
-
-void HMarkUnreachableBlocksPhase::MarkUnreachableBlocks() {
-  // If there is unreachable code in the graph, propagate the unreachable marks
-  // using a fixed-point iteration.
-  bool changed = true;
-  const ZoneList<HBasicBlock*>* blocks = graph()->blocks();
-  while (changed) {
-    changed = false;
-    for (int i = 0; i < blocks->length(); i++) {
-      HBasicBlock* block = blocks->at(i);
-      if (!block->IsReachable()) continue;
-      bool is_reachable = blocks->at(0) == block;
-      for (HPredecessorIterator it(block); !it.Done(); it.Advance()) {
-        HBasicBlock* predecessor = it.Current();
-        // A block is reachable if one of its predecessors is reachable,
-        // doesn't deoptimize and either is known to transfer control to the
-        // block or has a control flow instruction for which the next block
-        // cannot be determined.
-        if (predecessor->IsReachable() && !predecessor->IsDeoptimizing()) {
-          HBasicBlock* pred_succ;
-          bool known_pred_succ =
-              predecessor->end()->KnownSuccessorBlock(&pred_succ);
-          if (!known_pred_succ || pred_succ == block) {
-            is_reachable = true;
-            break;
-          }
-        }
-        if (block->is_osr_entry()) {
-          is_reachable = true;
-        }
-      }
-      if (!is_reachable) {
-        block->MarkUnreachable();
-        changed = true;
-      }
-    }
-  }
-}
-
-
-void HMarkUnreachableBlocksPhase::Run() {
-  MarkUnreachableBlocks();
-}
-
-}  // namespace internal
-}  // namespace v8