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Make dep node indices persistent between sessions#62038

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Zoxc wants to merge 1 commit intorust-lang:masterfrom
Zoxc:pre-gc-dep-graph
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Make dep node indices persistent between sessions#62038
Zoxc wants to merge 1 commit intorust-lang:masterfrom
Zoxc:pre-gc-dep-graph

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@Zoxc Zoxc commented Jun 21, 2019

This makes marking dep nodes green faster (and lock free in the case with no diagnostics). This change is split out from #60035.

Unlike #60035 this makes loading the dep graph slower because it loads 2 copies of the dep graph, one immutable and one mutable.

Based on #61845.

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