Migrate most uses of Isolate::current_zone to Thread::zone.

runtime/vm/flow_graph_optimizer.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/flow_graph_optimizer.h"
 
 #include "vm/bit_vector.h"
 #include "vm/cha.h"
 #include "vm/compiler.h"
 #include "vm/cpu.h"
@@ skipping 5490 matching lines @@
 
   intptr_t index_constant() const {
     ASSERT(kind() == kConstantIndexed);
     return index_constant_;
   }
 
   static const char* DefinitionName(Definition* def) {
     if (def == NULL) {
       return "*";
     } else {
-      return Isolate::Current()->current_zone()->PrintToString(
+      return Thread::Current()->zone()->PrintToString(
             "v%" Pd, def->ssa_temp_index());
     }
   }
 
   const char* ToCString() const {
     switch (kind()) {
       case kNone:
         return "<none>";
 
       case kField: {
         const char* field_name = String::Handle(field().name()).ToCString();
         if (field().is_static()) {
-          return Isolate::Current()->current_zone()->PrintToString(
+          return Thread::Current()->zone()->PrintToString(
               "<%s>", field_name);
         } else {
-          return Isolate::Current()->current_zone()->PrintToString(
+          return Thread::Current()->zone()->PrintToString(
               "<%s.%s>", DefinitionName(instance()), field_name);
         }
       }
 
       case kVMField:
-        return Isolate::Current()->current_zone()->PrintToString(
+        return Thread::Current()->zone()->PrintToString(
             "<%s.@%" Pd ">",
             DefinitionName(instance()),
             offset_in_bytes());
 
       case kIndexed:
-        return Isolate::Current()->current_zone()->PrintToString(
+        return Thread::Current()->zone()->PrintToString(
             "<%s[%s]>",
             DefinitionName(instance()),
             DefinitionName(index()));
 
       case kConstantIndexed:
         if (element_size() == kNoSize) {
-          return Isolate::Current()->current_zone()->PrintToString(
+          return Thread::Current()->zone()->PrintToString(
               "<%s[%" Pd "]>",
               DefinitionName(instance()),
               index_constant());
         } else {
-          return Isolate::Current()->current_zone()->PrintToString(
+          return Thread::Current()->zone()->PrintToString(
               "<%s[%" Pd "|%" Pd "]>",
               DefinitionName(instance()),
               index_constant(),
               ElementSizeMultiplier(element_size()));
         }
     }
     UNREACHABLE();
     return "<?>";
   }
 
@@ skipping 3169 matching lines @@
 
   // Insert materializations at environment uses.
   for (intptr_t i = 0; i < exits_collector_.exits().length(); i++) {
     CreateMaterializationAt(
         exits_collector_.exits()[i], alloc, *slots);
   }
 }
 
 
 }  // namespace dart