Thread/Isolate refactoring: new(Isolate) -> new(Zone)

runtime/vm/flow_graph.cc

Index: runtime/vm/flow_graph.cc
===================================================================
--- runtime/vm/flow_graph.cc	(revision 44266)
+++ runtime/vm/flow_graph.cc	(working copy)
@@ -136,7 +136,9 @@
   }
   instr->InsertAfter(prev);
   ASSERT(instr->env() == NULL);
-  if (env != NULL) env->DeepCopyTo(isolate(), instr);
+  if (env != NULL) {
+    env->DeepCopyTo(zone(), instr);
+  }
 }
 
 
@@ -149,7 +151,9 @@
     AllocateSSAIndexes(instr->AsDefinition());
   }
   ASSERT(instr->env() == NULL);
-  if (env != NULL) env->DeepCopyTo(isolate(), instr);
+  if (env != NULL) {
+    env->DeepCopyTo(zone(), instr);
+  }
   return prev->AppendInstruction(instr);
 }
 
@@ -884,12 +888,12 @@
 void FlowGraph::AttachEnvironment(Instruction* instr,
                                   GrowableArray<Definition*>* env) {
   Environment* deopt_env =
-      Environment::From(isolate(),
+      Environment::From(zone(),
                         *env,
                         num_non_copied_params_,
                         parsed_function_);
   if (instr->IsClosureCall()) {
-    deopt_env = deopt_env->DeepCopy(isolate(),
+    deopt_env = deopt_env->DeepCopy(zone(),
                                     deopt_env->Length() - instr->InputCount());
   }
   instr->SetEnvironment(deopt_env);