[Chicken-janitors] #742: perform immediateness checks inline before calling C_mutate

[Chicken Trac]

#742: perform immediateness checks inline before calling C_mutate
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 Reporter:  felix                      |       Owner:  felix
     Type:  enhancement                |      Status:  new  
 Priority:  not urgent at all          |   Milestone:       
Component:  core libraries             |     Version:  4.7.x
 Keywords:  runtime mutation C_mutate  |  
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 By doing this an out-of-line function call may be avoided which could
 speed up code doing an excessive number of mutations or doing many
 mutations on the same storage location.

 There is also a patch by Joerg Wittenberger (attached) which does inline
 the test whether the assigned value is in the nursery (I'm not completely
 sure about this patch - for some irrational reason I don't trust
 `C_in_stackp`).

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Ticket URL: <http://bugs.call-cc.org/ticket/742>
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