[Bug 239672] gcov: Optimize list traverse by using LIST_FOREACH_SAFE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239672

Chuhong Yuan <hslester96 at gmail.com> changed:

           What    |Removed                     |Added
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 Attachment #206304|0                           |1
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--- Comment #2 from Chuhong Yuan <hslester96 at gmail.com> ---
Created attachment 206319
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=206319&action=edit
gcov_fs patch v2

Use two passes to optimize the traverse.
In the first pass, add all nodes which need to be removed to a queue.
In the second pass, traverse the queue and remove the nodes.

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