Change ASSERT to CHECK in test-heap.  Use int instead of intptr_t to make MacOS compiler happier.
Change ASSERT to CHECK in test-heap.  Use int instead of intptr_t to
make MacOS compiler happier.

We need to clean this stuff up.

TBR=whesse@chromium.org
Review URL: http://codereview.chromium.org/182044

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@2802 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh