[Harmony Wiki] Update of "Jitrino OPT/gvn" by Mikhail Fursov

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The following page has been changed by Mikhail Fursov:
http://wiki.apache.org/harmony/Jitrino_OPT/gvn

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- Hash value numbering (hvn) works in a local scope.
- Global value numbering's scope is the whole method. 
+ ''' 'gvn' ''' - HIR transformation that performs global elimination of expressions
+ [[BR]][[BR]]
+ While the [:Jitrino_OPT/hvn: Hash value numbering] optimization works in a local scope the scope for this optimization is the whole method