Move CHA state keeping from Isolate to Thread.

runtime/vm/compiler.cc

 // Copyright (c) 2012, 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/compiler.h"
 
 #include "vm/assembler.h"
 
 #include "vm/ast_printer.h"
 #include "vm/block_scheduler.h"
@@ skipping 379 matching lines @@
   volatile bool use_far_branches = false;
   while (!done) {
     const intptr_t prev_deopt_id = isolate->deopt_id();
     isolate->set_deopt_id(0);
     LongJumpScope jump;
     if (setjmp(*jump.Set()) == 0) {
       FlowGraph* flow_graph = NULL;
 
       // Class hierarchy analysis is registered with the isolate in the
       // constructor and unregisters itself upon destruction.
-      CHA cha(isolate);
+      CHA cha(thread);
 
       // TimerScope needs an isolate to be properly terminated in case of a
       // LongJump.
       {
         TimerScope timer(FLAG_compiler_stats,
                          &CompilerStats::graphbuilder_timer,
                          isolate);
         ZoneGrowableArray<const ICData*>* ic_data_array =
             new(zone) ZoneGrowableArray<const ICData*>();
         if (optimized) {
@@ skipping 327 matching lines @@
               }
               ISL_Print("Patch unoptimized '%s' entry point %#" Px "\n",
                   function.ToFullyQualifiedCString(),
                   Code::Handle(function.unoptimized_code()).EntryPoint());
             }
           }
           function.AttachCode(code);
 
           // Register code with the classes it depends on because of CHA.
           for (intptr_t i = 0;
-               i < isolate->cha()->leaf_classes().length();
+               i < thread->cha()->leaf_classes().length();
                ++i) {
-            isolate->cha()->leaf_classes()[i]->RegisterCHACode(code);
+            thread->cha()->leaf_classes()[i]->RegisterCHACode(code);
           }
 
           for (intptr_t i = 0;
                i < flow_graph->guarded_fields()->length();
                i++) {
             const Field* field = (*flow_graph->guarded_fields())[i];
             field->RegisterDependentCode(code);
           }
         } else {  // not optimized.
           if (function.ic_data_array() == Array::null()) {
@@ skipping 470 matching lines @@
     const Object& result =
       PassiveObject::Handle(isolate->object_store()->sticky_error());
     isolate->object_store()->clear_sticky_error();
     return result.raw();
   }
   UNREACHABLE();
   return Object::null();
 }
 
 }  // namespace dart