[Chicken-janitors] #160: implement minimal global value propagation

[Chicken Trac]

#160: implement minimal global value propagation
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 Reporter:  felix        |       Owner:  felix
     Type:  enhancement  |      Status:  new  
 Priority:  minor        |   Milestone:  4.4.0
Component:  compiler     |     Version:  4.3.x
 Keywords:               |  
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 in the toplevel scan, expressions like `(set! <var1> <var2>)` can be used
 to mark `<var1>` as an alias to `<var2>`, if `<var2>` is itself an alias
 or an intrinsic.

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Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/160>
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