Log the number of objects in a Pack when it is deleted in debug builds to help JS app developers find leaks.
Log the number of objects in a Pack when it is deleted in debug builds to help JS app developers find leaks.

TEST=used it in a JS app to help identify a leak
BUG=none
Review URL: http://codereview.chromium.org/6542028

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@75441 0039d316-1c4b-4281-b951-d872f2087c98

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