429168: fix for PdfJs regression

src/heap/heap-inl.h

 // 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.
 
 #ifndef V8_HEAP_HEAP_INL_H_
 #define V8_HEAP_HEAP_INL_H_
 
 #include <cmath>
 
 #include "src/base/platform/platform.h"
@@ skipping 440 matching lines @@
                             obj->IsExternalString());
     case OLD_DATA_SPACE:
       return dst == src && dst == TargetSpaceId(type);
     case CODE_SPACE:
       return dst == src && type == CODE_TYPE;
     case MAP_SPACE:
     case CELL_SPACE:
     case PROPERTY_CELL_SPACE:
     case LO_SPACE:
       return false;
-    case INVALID_SPACE:
-      break;
   }
   UNREACHABLE();
   return false;
 }
 
 
 void Heap::CopyBlock(Address dst, Address src, int byte_size) {
   CopyWords(reinterpret_cast<Object**>(dst), reinterpret_cast<Object**>(src),
             static_cast<size_t>(byte_size / kPointerSize));
 }
@@ skipping 298 matching lines @@
 
 void VerifySmisVisitor::VisitPointers(Object** start, Object** end) {
   for (Object** current = start; current < end; current++) {
     CHECK((*current)->IsSmi());
   }
 }
 }
 }  // namespace v8::internal
 
 #endif  // V8_HEAP_HEAP_INL_H_