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

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

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- Hash value numbering pass eliminates common sub-expressions. This pass uses an in-order depth-first traversal of the dominator tree instead of the more expensive iterative data flow analysis. High-level value numbering effectively eliminates redundant address computation and check instructions. For example, chkzero(), chknull(), and chkcast() HIR instructions are redundant if guarded by explicit conditional branches.
+ ''' 'hvn' ''' - hash value numbering based optimization
+ [[BR]][[BR]]
+ Hash value numbering pass eliminates common sub-expressions. This pass uses an in-order depth-first traversal of the dominator tree instead of the more expensive iterative data flow analysis. 
+ [[BR]][[BR]]
+ High-level value numbering effectively eliminates redundant address computation and check instructions. 
+ [[BR]][[BR]]
+ For example, chkzero(), chknull(), and chkcast() HIR instructions are redundant if guarded by explicit conditional branches.