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
Merge remote branch 'origin/trunk' into trunk
Merge remote branch 'origin/trunk' into trunk-gd