John McCall f304c321f3 Rewrite MetadataCache to be a more natural extension of ConcurrentMap. ...

Change generic witness table instantiation to use a more lightweight
entry scheme that allocates the witness table as part of the entry.

In contrast, change generic metadata instantiation to use a more
straightforward allocation scheme where the metadata is a totally
independent allocation.

This is preparation for proper cyclic-dependency handling.

2018-03-08 02:29:20 -05:00

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