rustc_query_system: reduce dependency graph memory usage#79589

Merged

bors merged 8 commits intorust-lang:masterfrom

tgnottingham:shared_dep_graph

Dec 24, 2020

Commits on Dec 22, 2020

rustc_query_system: share previous graph data with current graph
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rustc_query_system: share previous graph edges with current graph
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rustc_query_system: use more space-efficient edges representation
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rustc_query_system: minor cleanup
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rustc_query_system: remove inline annotation from edge_count
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rustc_query_system: rename intern_node to intern_new_node
tgnottingham
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rustc_query_system: add more comments for dependency graph
tgnottingham
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rustc_query_system: avoid race condition when using edge_count
tgnottingham
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