Make size for has_many :through use counter cache if it exists. Closes #9734 [xaviershay]
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7692 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7692 5ecf4fe2-1ee6-0310-87b1-e25e094e27de