Isolate::PrintStack: restore default verbose object printing

src/string-stream.h

 // Copyright 2014 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.
 
 #ifndef V8_STRING_STREAM_H_
 #define V8_STRING_STREAM_H_
 
 #include "src/allocation.h"
 #include "src/base/smart-pointers.h"
 #include "src/handles.h"
@@ skipping 82 matching lines @@
     Object** u_handle_;
     void* u_pointer_;
   } data_;
 };
 
 
 class StringStream final {
  public:
   enum ObjectPrintMode { kPrintObjectConcise, kPrintObjectVerbose };
   StringStream(StringAllocator* allocator,
-               ObjectPrintMode object_print_mode = kPrintObjectConcise)
+               ObjectPrintMode object_print_mode = kPrintObjectVerbose)
       : allocator_(allocator),
         object_print_mode_(object_print_mode),
         capacity_(kInitialCapacity),
         length_(0),
         buffer_(allocator_->allocate(kInitialCapacity)) {
     buffer_[0] = 0;
   }
 
   bool Put(char c);
   bool Put(String* str);
@@ skipping 60 matching lines @@
 
   bool full() const { return (capacity_ - length_) == 1; }
   int space() const { return capacity_ - length_; }
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringStream);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_STRING_STREAM_H_