Brad King 22aa6b67b4 cmListFileCache: Refactor cmListFileBacktrace internals ...

Replace use of raw pointers and explicit reference counting with
`std::shared_ptr<>`.  Use a discriminated union to store either the
bottom level or a call/file context in each heap-allocated entry.
This avoids storing a copy of the bottom in every `cmListFileBacktrace`
instance and shrinks the structure to a single `shared_ptr`.

2018-09-24 17:29:15 -04:00

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