Introduce a PrototypeIterator template and use it all over the place

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index e86059b7198631ce25d32437c35cd9cc9b64155c..a497cf8544353ea9c6c3e6498d4a51a66eb03ff3 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -8,6 +8,7 @@
 #include "src/disassembler.h"
 #include "src/jsregexp.h"
 #include "src/objects-visiting.h"
+#include "src/prototype-iterator.h"
 
 namespace v8 {
 namespace internal {
@@ -422,7 +423,7 @@ void JSObject::JSObjectPrint(FILE* out) {
   PrintElementsKind(out, this->map()->elements_kind());
   PrintF(out,
          "]\n - prototype = %p\n",
-         reinterpret_cast<void*>(GetPrototype()));
+         reinterpret_cast<void*>(SAFE_GET_PROTOTYPE_FAST(this)));
   PrintF(out, " {\n");
   PrintProperties(out);
   PrintTransitions(out);