Internalize strings in-place

src/objects-printer.cc

 // Copyright 2012 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/objects.h"
 
 #include <iomanip>
 #include <memory>
 
 #include "src/bootstrapper.h"
@@ skipping 832 matching lines @@
   os << "\n - stack_frames: " << Brief(stack_frames());
   JSObjectPrintBody(os, this);
 }
 
 
 void String::StringPrint(std::ostream& os) {  // NOLINT
   if (StringShape(this).IsInternalized()) {
     os << "#";
   } else if (StringShape(this).IsCons()) {
     os << "c\"";
+  } else if (StringShape(this).IsThin()) {
+    os << ">\"";
   } else {
     os << "\"";
   }
 
   const char truncated_epilogue[] = "...<truncated>";
   int len = length();
   if (!FLAG_use_verbose_printer) {
     if (len > 100) {
       len = 100 - sizeof(truncated_epilogue);
     }
@@ skipping 852 matching lines @@
     printf("Not a transition array\n");
   } else {
     reinterpret_cast<i::TransitionArray*>(object)->Print();
   }
 }
 
 extern void _v8_internal_Print_StackTrace() {
   i::Isolate* isolate = i::Isolate::Current();
   isolate->PrintStack(stdout);
 }