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Change CallGraph::Prog to be a reference. idx::Program means to be a global object to the Index library.

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Document that CompilerInvocation::createDiagnostics keeps a reference to the DiagnosticOptions, and update callers to make sure they don't pass in a temporary.

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Move tools/wpa to examples/wpa, and unbreak its build.

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Patch by Simone Pellegrini.


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necessary.

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 - Root is the main function or 0.
 - ExternalCallingNode has edges to all external functions.


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