PIG-3451: EvalFunc<T> ctor reflection to determine value of type param T is brittle (hazen via aniket486)

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1531384 13f79535-47bb-0310-9956-ffa450edef68
PIG-3512: Reducer estimater is broken by PIG-3497

git-svn-id: https://svn.apache.org/repos/asf/pig/trunk@1531441 13f79535-47bb-0310-9956-ffa450edef68