Introduce a PrototypeIterator template and use it all over the place

src/deoptimizer.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/disasm.h"
 #include "src/full-codegen.h"
 #include "src/global-handles.h"
 #include "src/macro-assembler.h"
 #include "src/prettyprinter.h"
+#include "src/prototype-iterator.h"
 
 
 namespace v8 {
 namespace internal {
 
 static MemoryChunk* AllocateCodeChunk(MemoryAllocator* allocator) {
   return allocator->AllocateChunk(Deoptimizer::GetMaxDeoptTableSize(),
                                   OS::CommitPageSize(),
 #if defined(__native_client__)
   // The Native Client port of V8 uses an interpreter,
@@ skipping 427 matching lines @@
 }
 
 
 void Deoptimizer::DeoptimizeGlobalObject(JSObject* object) {
   if (FLAG_trace_deopt) {
     CodeTracer::Scope scope(object->GetHeap()->isolate()->GetCodeTracer());
     PrintF(scope.file(), "[deoptimize global object @ 0x%08" V8PRIxPTR "]\n",
         reinterpret_cast<intptr_t>(object));
   }
   if (object->IsJSGlobalProxy()) {
-    Object* proto = object->GetPrototype();
+    Object* proto = SAFE_GET_PROTOTYPE_FAST(object);
     CHECK(proto->IsJSGlobalObject());
     Context* native_context = GlobalObject::cast(proto)->native_context();
     MarkAllCodeForContext(native_context);
     DeoptimizeMarkedCodeForContext(native_context);
   } else if (object->IsGlobalObject()) {
     Context* native_context = GlobalObject::cast(object)->native_context();
     MarkAllCodeForContext(native_context);
     DeoptimizeMarkedCodeForContext(native_context);
   }
 }
@@ skipping 3109 matching lines @@
 }
 
 
 void DeoptimizedFrameInfo::Iterate(ObjectVisitor* v) {
   v->VisitPointer(BitCast<Object**>(&function_));
   v->VisitPointers(parameters_, parameters_ + parameters_count_);
   v->VisitPointers(expression_stack_, expression_stack_ + expression_count_);
 }
 
 } }  // namespace v8::internal