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

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

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+ ''' 'lower' ''' - Partial inlining for type checks
+ [[BR]][[BR]]
  Lowering pass performs basic instruction-level transformations to replace common helper calls with the corresponding HIR code. A helper call generally is performance-expensive, so that inlining the operation performed by a helper method can improve performance. This is especially true for operations that are proved to be redundant afterwards.