[Chicken-janitors] [Chicken-bugs] #383: add pre-gc-hook

[Chicken Scheme]

#383: add pre-gc-hook
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 Reporter:  felix           |       Owner:     
     Type:  enhancement     |      Status:  new
 Priority:  minor           |   Milestone:     
Component:  core libraries  |     Version:  2.7
 Keywords:  gchooks         |  
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 in addition to `C_post_gc_hook`, a pre-GC hook, incidentally named
 `C_pre_gc_hook` should be introduced.

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Ticket URL: <http://trac.callcc.org/ticket/383>
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