[PATCH] Keep track of canonical decls in Redeclarable.

[Richard Smith]

I think it's worth a 2-3% memory increase to remove this as a source of pathological performance problems. See also https://llvm.org/bugs/show_bug.cgi?id=21264 which would also be fixed by this change (that bug suggests an alternative, much more complex, strategy if the 2-3% memory increase isn't acceptable).


http://reviews.llvm.org/D8619

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