Pass zone explicitly to zone-allocation on x64 and ARM.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
===================================================================
--- src/x64/lithium-x64.h	(revision 10852)
+++ src/x64/lithium-x64.h	(working copy)
@@ -2181,6 +2181,7 @@
       : chunk_(NULL),
         info_(info),
         graph_(graph),
+        zone_(graph->isolate()->zone()),
         status_(UNUSED),
         current_instruction_(NULL),
         current_block_(NULL),
@@ -2210,6 +2211,7 @@
   LChunk* chunk() const { return chunk_; }
   CompilationInfo* info() const { return info_; }
   HGraph* graph() const { return graph_; }
+  Zone* zone() const { return zone_; }
 
   bool is_unused() const { return status_ == UNUSED; }
   bool is_building() const { return status_ == BUILDING; }
@@ -2318,6 +2320,7 @@
   LChunk* chunk_;
   CompilationInfo* info_;
   HGraph* const graph_;
+  Zone* zone_;
   Status status_;
   HInstruction* current_instruction_;
   HBasicBlock* current_block_;