Fixing remaining VC++ 2015 64-bit build breaks

third_party/WebKit/Source/wtf/BitVector.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 61 matching lines @@
     else
         memset(outOfLineBits()->bits(), 0, byteCount(size()));
 }
 
 BitVector::OutOfLineBits* BitVector::OutOfLineBits::create(size_t numBits)
 {
     // Because of the way BitVector stores the pointer, memory tools
     // will erroneously report a leak here.
     WTF_INTERNAL_LEAK_SANITIZER_DISABLED_SCOPE;
     numBits = (numBits + bitsInPointer() - 1) & ~(bitsInPointer() - 1);
+    numBits = (numBits + bitsInPointer() - 1) & ~(bitsInPointer() - static_cast<size_t>(1));
     size_t size = sizeof(OutOfLineBits) + sizeof(uintptr_t) * (numBits / bitsInPointer());
     void* allocation = Partitions::bufferMalloc(size, WTF_HEAP_PROFILER_TYPE_NAME(OutOfLineBits));
     OutOfLineBits* result = new (NotNull, allocation) OutOfLineBits(numBits);
     return result;
 }
 
 void BitVector::OutOfLineBits::destroy(OutOfLineBits* outOfLineBits)
 {
     Partitions::bufferFree(outOfLineBits);
 }
@@ skipping 24 matching lines @@
 {
     for (size_t i = 0; i < size(); ++i) {
         if (get(i))
             out.printf("1");
         else
             out.printf("-");
     }
 }
 
 } // namespace WTF