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

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

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+ ''' 'dce' ''' is stands for Dead Code Elimination
+ [[BR]][[BR]]
  The pass detects and removes dead code by using a sparse liveness traversal over use-def links of the SSA form.
+ [[BR]]
- As DCE may produce some unreachable code it worth UnreachableCodeEliminator (UCE) follows dce in the HLO path.
+ As 'dce' may produce some unreachable code it worth having [:Jitrino_OPT/uce: Unreachable Code Eliminator] follows 'dce' in the HLO path.