hg: kulla/dev/langtools: Fix over eager variable reset to null messages from REPL tool.

[robert.field at oracle.com]

Changeset: 711643248fd3
Author:    rfield
Date:      2015-03-19 14:39 -0700
URL:       http://hg.openjdk.java.net/kulla/dev/langtools/rev/711643248fd3

Fix over eager variable reset to null messages from REPL tool.

! repl/TODO
! repl/src/tool/Repl.java
! repl/testng/test/ToolBasicTest.java