Tune rosalloc buffer sizes.
We now use one-page buffers for size brackets 4-7, instead of two-page buffers, and the first 8 size brackets for thread-local allocations, instead of 11. No slowdown observed with MemAllocTest, EvaluateAndApplyChanges, and BinaryTrees. (cherrypick commit c4cd95fa) Bug: 18377775 Change-Id: I311f3adf9cab660d258833b17df7e6d905f73c72
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