[crankshaft] Add baseline implementation of for-of.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 4a3dd2710b1514dcf0c179575a2e5420c132cfde..fd1b72264118df535763e8ae440d326ccda432c8 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -5406,7 +5406,37 @@ void HOptimizedGraphBuilder::VisitForOfStatement(ForOfStatement* stmt) {
   DCHECK(!HasStackOverflow());
   DCHECK(current_block() != NULL);
   DCHECK(current_block()->HasPredecessor());
-  return Bailout(kForOfStatement);
+  CHECK_ALIVE(VisitForEffect(stmt->assign_iterator()));
+  DCHECK(current_block() != NULL);
+  HBasicBlock* loop_entry = BuildLoopEntry(stmt);
+
+  HBasicBlock* body_entry = graph()->CreateBasicBlock();
+  HBasicBlock* loop_successor = graph()->CreateBasicBlock();
+  CHECK_BAILOUT(VisitForEffect(stmt->next_result()));
+  CHECK_BAILOUT(
+      VisitForControl(stmt->result_done(), loop_successor, body_entry));
+  if (body_entry->HasPredecessor()) {
+    body_entry->SetJoinId(stmt->BackEdgeId());
+    set_current_block(body_entry);
+  }
+  if (loop_successor->HasPredecessor()) {
+    loop_successor->SetJoinId(stmt->ExitId());
+  } else {
+    loop_successor = NULL;
+  }
+
+  BreakAndContinueInfo break_info(stmt, scope());
+  if (current_block() != NULL) {
+    BreakAndContinueScope push(&break_info, this);
+    CHECK_BAILOUT(VisitForEffect(stmt->assign_each()));
+    CHECK_BAILOUT(VisitLoopBody(stmt, loop_entry));
+  }
+  HBasicBlock* body_exit =
+      JoinContinue(stmt, current_block(), break_info.continue_block());
+
+  HBasicBlock* loop_exit = CreateLoop(stmt, loop_entry, body_exit,
+                                      loop_successor, break_info.break_block());
+  set_current_block(loop_exit);
 }