Add explicit integer type-casts to make WIN64 build without errors.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
===================================================================
--- test/cctest/test-heap.cc	(revision 2791)
+++ test/cctest/test-heap.cc	(working copy)
@@ -179,7 +179,7 @@
 TEST(Tagging) {
   InitializeVM();
   int request = 24;
-  ASSERT_EQ(request, OBJECT_SIZE_ALIGN(request));
+  ASSERT_EQ(static_cast<intptr_t>(request), OBJECT_SIZE_ALIGN(request));
   CHECK(Smi::FromInt(42)->IsSmi());
   CHECK(Failure::RetryAfterGC(request, NEW_SPACE)->IsFailure());
   CHECK_EQ(request, Failure::RetryAfterGC(request, NEW_SPACE)->requested());