TEZ-1386 breaks hadoop 2 compilation in trunk

    [javac] /Users/cheolsoop/workspace/pig-apache/src/org/apache/pig/backend/hadoop/executionengine/tez/TezDagBuilder.java:599: error: no suitable method found for createMRInputPayload(byte[],MRSplitsProto)
    [javac]                             .setUserPayload(MRHelpers.createMRInputPayload(
    [javac]                                                      ^
    [javac]     method MRHelpers.createMRInputPayload(ByteString,MRSplitsProto,boolean) is not applicable
    [javac]       (actual and formal argument lists differ in length)
    [javac]     method MRHelpers.createMRInputPayload(Configuration,MRSplitsProto) is not applicable
    [javac]       (actual argument byte[] cannot be converted to Configuration by method invocation conversion)
    [javac]     method MRHelpers.createMRInputPayload(byte[]) is not applicable
    [javac]       (actual and formal argument lists differ in length)
    [javac] /Users/cheolsoop/workspace/pig-apache/src/org/apache/pig/backend/hadoop/executionengine/tez/optimizers/LoaderProcessor.java:133: error: method generateInputSplitsToMem in class MRHelpers cannot be applied to given types;
    [javac]             tezOp.getLoaderInfo().setInputSplitInfo(MRHelpers.generateInputSplitsToMem(conf));
    [javac]                                                              ^