New attempt to make the allocation routines 64 bit clean....

test/cctest/test-alloc.cc

Index: test/cctest/test-alloc.cc
===================================================================
--- test/cctest/test-alloc.cc	(revision 5551)
+++ test/cctest/test-alloc.cc	(working copy)
@@ -43,7 +43,7 @@
   NewSpace* new_space = Heap::new_space();
   static const int kNewSpaceFillerSize = ByteArray::SizeFor(0);
   while (new_space->Available() > kNewSpaceFillerSize) {
-    int available_before = new_space->Available();
+    int available_before = static_cast<int>(new_space->Available());
     CHECK(!Heap::AllocateByteArray(0)->IsFailure());
     if (available_before == new_space->Available()) {
       // It seems that we are avoiding new space allocations when