Reapply "Lazy deopt without code patching."

runtime/vm/weak_code.cc

 // Copyright (c) 2014, 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/weak_code.h"
 
 #include "platform/assert.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 58 matching lines @@
   UpdateArrayTo(Object::null_array());
   // Disable all code on stack.
   Code& code = Code::Handle();
   {
     DartFrameIterator iterator;
     StackFrame* frame = iterator.NextFrame();
     while (frame != NULL) {
       code = frame->LookupDartCode();
       if (IsOptimizedCode(code_objects, code)) {
         ReportDeoptimization(code);
-        DeoptimizeAt(code, frame->pc());
+        DeoptimizeAt(code, frame);
       }
       frame = iterator.NextFrame();
     }
   }
 
   // Switch functions that use dependent code to unoptimized code.
   WeakProperty& weak_property = WeakProperty::Handle();
   Object& owner = Object::Handle();
   Function& function = Function::Handle();
   for (intptr_t i = 0; i < code_objects.Length(); i++) {
@@ skipping 36 matching lines @@
       // Make non-OSR code non-entrant.
       if (!code.IsDisabled()) {
         ReportSwitchingCode(code);
         code.DisableDartCode();
       }
     }
   }
 }
 
 }  // namespace dart