[DO NOT MERGE]: Try out 128bit SipHash for incr. comp. hashes.#45028

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michaelwoerister wants to merge 12 commits intorust-lang:masterfrom michaelwoerister:sip128-hashes

Commits on Oct 2, 2017

incr.comp.: Determine red/green state of every new node.
michaelwoerister
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incr.comp.: Add minimal version of try_mark_green procedure.
michaelwoerister
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incr.comp.: Re-execute queries during red/green marking in order to find out their color.
michaelwoerister
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incr.comp.: Make some DepNodes non-anonymous.
michaelwoerister
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incr.comp.: Add some logging to DepGraph::try_mark_green().
michaelwoerister
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incr.comp.: Use red/green tracking for CGU re-use.
michaelwoerister
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incr.comp.: Build DepGraphQuery from new dep-graph impl.
michaelwoerister
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incr.comp.: Remove saving and loading of legacy dep-graph.
michaelwoerister
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incr.comp.: Remove legacy dep-graph runtime.
michaelwoerister
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incr.comp.: Do some cleanup.
michaelwoerister
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Commits on Oct 4, 2017