Deron Eriksson closed SYSTEMML-949.

> Delete ANTLR tokens files during initialize phase
> -------------------------------------------------
>                 Key: SYSTEMML-949
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-949
>             Project: SystemML
>          Issue Type: Task
>          Components: Build
>            Reporter: Deron Eriksson
>            Assignee: Deron Eriksson
>             Fix For: SystemML 0.11
> With the move to antlr 4.5.3, the antlr4-maven-plugin gives a "No grammars to 
> process" message during "mvn clean package" if *.tokens files have previously 
> been generated. Using previously generated tokens files can lead to 
> unexpected behavior (see comments from 
> https://github.com/apache/incubator-systemml/pull/243).
> The tokens files can be deleted during the "initialize" maven lifecycle phase 
> so that they will be regenerated during the "generate-sources" maven 
> lifecycle phase (that the antlr4 goal binds to).

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