[SPARK-22033][CORE] BufferHolder, other size checks should account for the specific VM array size limitations#19266

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srowen:SPARK-22033

Commits on Sep 18, 2017

Try to avoid allocating an array bigger than Integer.MAX_VALUE - 8, which is the actual max size on some JVMs, in several places
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Commits on Sep 19, 2017

Revert several changes that check conditions that will fail anyway immediately; stick to 'avoidable' allocations that are too large
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Commits on Sep 20, 2017

Update from review comments
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