Oilpan: ThreadHeap<Header>::pageFromAddress doesn't need to iterate LargeObjects twice
Oilpan: ThreadHeap<Header>::pageFromAddress doesn't need to iterate LargeObjects twice

BUG=420515

Review URL: https://codereview.chromium.org/759563002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@185930 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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