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/dead_code_elimination.cc b/compiler/optimizing/dead_code_elimination.cc
index 509478c..7d509a2 100644
--- a/compiler/optimizing/dead_code_elimination.cc
+++ b/compiler/optimizing/dead_code_elimination.cc
@@ -64,8 +64,8 @@
 void HDeadCodeElimination::RemoveDeadBlocks() {
   // Classify blocks as reachable/unreachable.
   ArenaAllocator* allocator = graph_->GetArena();
-  ArenaBitVector live_blocks(allocator, graph_->GetBlocks().Size(), false);
-  ArenaBitVector affected_loops(allocator, graph_->GetBlocks().Size(), false);
+  ArenaBitVector live_blocks(allocator, graph_->GetBlocks().size(), false);
+  ArenaBitVector affected_loops(allocator, graph_->GetBlocks().size(), false);
 
   MarkReachableBlocks(graph_->GetEntryBlock(), &live_blocks);
   bool removed_one_or_more_blocks = false;