[patch] resource leakage in KJS

[Germain Garand]

Dear KJS hackers,

I was investigating some compulsive CPU hogging building up over time and 
found out KJS::Debugger::attach doesn't check if an interpreter is already in 
its list. Apparently, it would happily add it over and over, after iterating 
the whole list of already attached interpreters.

When inline statements are repeteadly evaluated the effect rapidly becomes 
quite bad - and IIUC the pollution seems process wide.

So does attached patch looks OK or should that be fixed elsewhere?

Greetings,
Germain


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