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.h b/compiler/optimizing/code_generator.h
index a93d07a..11daf3f 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -176,7 +176,7 @@
                                 size_t maximum_number_of_live_core_registers,
                                 size_t maximum_number_of_live_fp_registers,
                                 size_t number_of_out_slots,
-                                const GrowableArray<HBasicBlock*>& block_order);
+                                const ArenaVector<HBasicBlock*>& block_order);
   int32_t GetStackSlot(HLocal* local) const;
   Location GetTemporaryLocation(HTemporary* temp) const;
 
@@ -488,7 +488,7 @@
   StackMapStream stack_map_stream_;
 
   // The order to use for code generation.
-  const GrowableArray<HBasicBlock*>* block_order_;
+  const ArenaVector<HBasicBlock*>* block_order_;
 
   // Whether we are using baseline.
   bool is_baseline_;