Minor fixes in objects printer.

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/disasm.h"
@@ skipping 48 matching lines @@
 
   switch (instance_type) {
     case SYMBOL_TYPE:
       Symbol::cast(this)->SymbolPrint(os);
       break;
     case MAP_TYPE:
       Map::cast(this)->MapPrint(os);
       break;
     case HEAP_NUMBER_TYPE:
       HeapNumber::cast(this)->HeapNumberPrint(os);
+      os << "\n";
       break;
     case MUTABLE_HEAP_NUMBER_TYPE:
       os << "<mutable ";
       HeapNumber::cast(this)->HeapNumberPrint(os);
-      os << ">";
+      os << ">\n";
       break;
     case SIMD128_VALUE_TYPE:
       Simd128Value::cast(this)->Simd128ValuePrint(os);
       break;
     case FIXED_DOUBLE_ARRAY_TYPE:
       FixedDoubleArray::cast(this)->FixedDoubleArrayPrint(os);
       break;
     case FIXED_ARRAY_TYPE:
       FixedArray::cast(this)->FixedArrayPrint(os);
       break;
@@ skipping 1497 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);
 }