Since I have the basic push-notification of CallSites I'm now looking into 
push-notification of SwitchPoints:

7071709: JSR 292: switchpoint invalidation should be pushed not pulled

Basically it should be the same, just needs some additional love in the 
compiler.

I looked into JRuby's usage of SwitchPoints and it seems it has something to do 
with constants.  Is there an existing benchmark that would benefit from the 
SwitchPoint optimization?  Seph also seems to use SwitchPoints, PHP.reboot does 
not (that's what grep tells me).

-- Christian
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