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  Cleaned up CpuFeature scope handling.
First of all, it has nothing to do with Isolates, it is related to the assembler 
at hand. Furthermore, the saving/restoring is platform-independent. Cleaned up 
some platform-specific stuff on the way. 
Note that there are some things which still need some cleanup, like e.g. using
EnumSet instead of uint64_t, making Probe() more uniform across platforms etc.,
but the CL is already big enough.
BUG= v8:2487
Committed:  http://code.google.com/p/v8/source/detail?r=13823
   
  
  
  
  
   
  
  
  
    
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