[heap] Uncommit unused large object page memory.
As a first step I uncommit the memory on the main thread. Also to measure impact and stability of that optimization. In a follow-up CL, the uncommitting should be moved on the concurrent thread. BUG= Review-Url: https://codereview.chromium.org/2032393002 Cr-Commit-Position: refs/heads/master@{#36763}
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