bug#17168: 24.3.50; Segfault at mark_object

[Richard Stallman]

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    If we can reduce Vpure_reachable to only contain symbols, then we can
    replace it with a `pinned' bit in the Lisp_Symbol struct and then walk
    the list of symbols during mark, marking all those symbols with the
    `pinned' bit.

It might be faster just to traverse a list of these symbols, since
there are not very many uninterned symbols with names that are pure.

-- 
Dr Richard Stallman
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