Optimizing: Tag arena allocations in HGraph.

Replace GrowableArray with ArenaVector in HGraph and related
classes HEnvironment, HLoopInformation, HInvoke and HPhi,
and tag allocations with new arena allocation types.

Change-Id: I3d79897af405b9a1a5b98bfc372e70fe0b3bc40d
diff --git a/compiler/optimizing/graph_visualizer.cc b/compiler/optimizing/graph_visualizer.cc
index 5b8e386..60a5955 100644
--- a/compiler/optimizing/graph_visualizer.cc
+++ b/compiler/optimizing/graph_visualizer.cc
@@ -679,7 +679,7 @@
                                  bool is_after_pass,
                                  bool graph_in_bad_state) const {
   DCHECK(output_ != nullptr);
-  if (!graph_->GetBlocks().IsEmpty()) {
+  if (!graph_->GetBlocks().empty()) {
     HGraphVisualizerPrinter printer(graph_,
                                     *output_,
                                     pass_name,
@@ -692,7 +692,7 @@
 
 void HGraphVisualizer::DumpGraphWithDisassembly() const {
   DCHECK(output_ != nullptr);
-  if (!graph_->GetBlocks().IsEmpty()) {
+  if (!graph_->GetBlocks().empty()) {
     HGraphVisualizerPrinter printer(graph_,
                                     *output_,
                                     "disassembly",