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

runtime/vm/stack_frame.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/stack_frame.h"
 
 #include "platform/memory_sanitizer.h"
 #include "vm/assembler.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
@@ skipping 12 matching lines @@
 bool StackFrame::IsStubFrame() const {
   ASSERT(!(IsEntryFrame() || IsExitFrame()));
   uword saved_pc =
       *(reinterpret_cast<uword*>(fp() + (kPcMarkerSlotFromFp * kWordSize)));
   return (saved_pc == 0);
 }
 
 
 const char* StackFrame::ToCString() const {
   ASSERT(isolate_ == Isolate::Current());
-  Zone* zone = Isolate::Current()->current_zone();
+  Zone* zone = Thread::Current()->zone();
   if (IsDartFrame()) {
     const Code& code = Code::Handle(LookupDartCode());
     ASSERT(!code.IsNull());
     const Object& owner = Object::Handle(code.owner());
     ASSERT(!owner.IsNull());
     if (owner.IsFunction()) {
       const Function& function = Function::Cast(owner);
       return zone->PrintToString(
           "[%-8s : sp(%#" Px ") fp(%#" Px ") pc(%#" Px ") %s ]",
           GetName(), sp(), fp(), pc(),
@@ skipping 448 matching lines @@
     if (deopt_instr->kind() == DeoptInstr::kCallerFp) {
       return (index - num_materializations_);
     }
   }
   UNREACHABLE();
   return 0;
 }
 
 
 }  // namespace dart