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/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index bd7cb12..5e4952f 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -312,7 +312,7 @@
   }
 
   void Initialize() OVERRIDE {
-    block_labels_.SetSize(GetGraph()->GetBlocks().Size());
+    block_labels_.SetSize(GetGraph()->GetBlocks().size());
   }
 
   bool NeedsTwoRegisters(Primitive::Type type) const OVERRIDE {