1) In v8, ic.cc, i see functions like  
*RUNTIME_FUNCTION(Runtime_KeyedLoadIC_Miss)*. 
    I don't understand how are they invoked. Is there some connection with  * 
__ TailCallRuntime(Runtime::kKeyedLoadIC_Miss, arg_count, 1);*
    from ic-<arch>.cc? 

2) what is the difference between *Runtime_KeyedLoadIC_Miss* and 
*Runtime_LoadIC_Miss 
*?

3)  Can I profile these runtime functions using some c++ profiler? I want 
to see how much time is spent on subset of these runtime functions.
     

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