Progress towards making Zones independent of Isolates and Threads.

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index 642a0a00385a94e730c7bba517f0466caa6bfc47..dba9b0a24eddd6a78ecf3bca49c54d197a70f6ad 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -2227,11 +2227,12 @@ class LChunk: public ZoneObject {
 
 class LChunkBuilder BASE_EMBEDDED {
  public:
-  LChunkBuilder(CompilationInfo* info, HGraph* graph, LAllocator* allocator)
+  LChunkBuilder(CompilationInfo* info, HGraph* graph, LAllocator* allocator,
+                Zone* zone)
       : chunk_(NULL),
         info_(info),
         graph_(graph),
-        zone_(graph->isolate()->zone()),
+        zone_(zone),
         status_(UNUSED),
         current_instruction_(NULL),
         current_block_(NULL),